Статті в журналах з теми "Timetable routing"

Periodic timetabling is an important, yet computationally challenging, problem in public transportation planning. The usual objective when designing a timetable is to minimize passenger travel time. However, in most approaches, it is ignored that the routes of the passengers depend on the timetable, so handling their routing separately leads to timetables that are suboptimal for the passengers. This has recently been recognized, but integrating the passenger routing in the optimization is computationally even harder than solving the classic periodic timetabling problem. In our paper, we develop an exact preprocessing method for reducing the problem size and a heuristic reduction approach in which only a subset of the passengers is considered. It provides upper and lower bounds on the objective value, such that it can be adjusted with respect to quality and computation time. Together, we receive an approach that is applicable for real-world problems. We experimentally evaluate the performance of the approach on a benchmark example and on three close-to-real-world instances. Furthermore, we prove that the ratio between the classic problem without routing and the problem with integrated routing is bounded under weak and realistic assumptions.

<p><strong>Abstract.</strong> Most of the existing public transit routing algorithms were developed on the basis of graph theory. Recently, algorithms are being developed that can compute for O-D public transit paths by using timetable information only, not using network structure consisting of nodes and links. The timetable-based public transit routing algorithm produces one shortest path to destination, using departure time and arrival time by stop. But it has limitations in reflecting additional factors, such as transfer penalty and alternative path selection, in the process of path calculation. In addition, since public transit passengers tend to choose one among various alternative paths, it is necessary to calculate multiple paths rather than a single path as in the existing methods. Therefore, this study proposes an improved RAPTOR algorithm that can consider transfer penalty and produce multiple paths, while it is based on RAPTOR, the existing timetable-based public transit routing algorithm. The transfer penalty was applied at the point of transfer, and differently according to transfer types. As a result of analyzing computed paths of the algorithms before and after improvement, it was found that computed paths with the improved RAPTOR algorithm proposed by this study were more similar to Seoul public transit passengers' actual travel paths than computed paths by the existing RAPTOR alone.</p>

As an important means of transportation, urban rail transit provides effective mobility, sufficient punctuality, strong security, and environment-friendliness in large cities. However, this transportation mode cannot offer a 24-h service to passengers with the consideration of operation cost and the necessity of maintenance, that is, a final time should be set. Therefore, operators need to design a last train timetable in consideration of the number of successful travel passengers and the total passenger transfer waiting time. This paper proposes a bi-level last train timetable optimization model. Its upper level model aims to maximize the number of passengers who travel by the last train service successful and minimize their transfer waiting time, and its lower level model aims to determine passenger route choice considering the detour routing strategy based on the last train timetable. A genetic algorithm is proposed to solve the upper level model, and the lower level model is solved by a semi-assignment algorithm. The implementation of the proposed model in the Beijing urban rail transit network proves that the model can optimize not only the number of successful transfer directions and successful travel passengers but also the passenger transfer waiting time of successful transfer directions. The optimization results can provide operators detailed information about the stations inaccessible to passengers from all origin stations and uncommon path guides for passengers of all origin–destination pairs. These types of information facilitate the operation of real-world urban rail transit systems.

In recent years, the government of China has paid increasing attention to environmental protection issues and has frequently emphasized the importance of ecological civilization. The high-speed railway transportation mode has outstanding advantages in terms of land utilization, energy conservation and environmental protection. China’s high-speed railway networking features are increasingly prominent and are constructed based on the rapid passenger transport network. Additionally, they save resources and are environmentally friendly while meeting safety, punctuality and profitability standards. Electric multiple unit (EMU) routing plan optimization is an important issue for improving operational EMU efficiency and reducing operational costs. At present, the Chinese EMU routing plans for holidays and weekdays are prepared separately because the holiday train timetable requires more EMUs and maintenance tasks. Different integrative optimization measures are considered, and a model is constructed to integrate an optimized weekday and holiday EMU routing plan problem and minimize the EMUs used and EMU maintenance tasks. The proposed model is based on the branch-and-price algorithm, and a real-world case study is conducted. The real-world numerical experiment shows that the amount of EMU maintenance can be reduced to some extent through the integrated optimization of tasks, but it is difficult to reduce the number of EMUs due to the structure of the train operational timetable.

To avoid conflicts among trains at stations and provide passengers with a periodic train timetable to improve service level, this paper mainly focuses on the problem of multi-periodic train timetabling and routing by optimizing the routes of trains at stations and their entering time and leaving time on each chosen arrival–departure track at each visited station. Based on the constructed directed graph, including unidirectional and bidirectional tracks at stations and in sections, a mixed integer linear programming model with the goal of minimizing the total travel time of trains is formulated. Then, a strategy is introduced to reduce the number of constraints for improving the solved efficiency of the model. Finally, the performance, stability and practicability of the proposed method, as well as the impact of some main factors on the model are analyzed by numerous instances on both a constructed railway network and Guang-Zhu inter-city railway; they are solved using the commercial solver WebSphere ILOG CPLEX (International Business Machines Corporation, New York, NY, USA). Experimental results show that integrating multi-periodic train timetabling and routing can be conducive to improving the quality of a train timetable. Hence, good economic and social benefits for high-speed rail can be achieved, thus, further contributing to the sustained development of both high-speed railway systems and society.

At present, most urban rail transit systems adopt an operation mode with a single long routing. The departure frequency is determined by the maximum section passenger flow. However, when the passenger flow varies greatly within different sections, this mode will lead to a low load factor in some sections, resulting in a waste of capacity. In view of this situation, this paper develops a nonlinear integer programming model to determine an optimal timetable with a balanced scheduling mode, where the wasted capacity at a constant departure frequency can be reduced with a slight increase in passenger waiting time. Then, we simplify the original model into a single-objective integer optimization model through normalization. A genetic algorithm is designed to find the optimal solution. Finally, a numerical example is presented based on real-world passenger and operation data from Beijing Metro Line 4. The results show that the double-routing optimization model can reduce wasted capacity by 9.5%, with a 4.5% increase in passenger waiting time, which illustrates the effectiveness of this optimization model.

This study explores a road–rail intermodal routing problem. To improve the carbon efficiency of transportation, reducing CO2 emissions is considered by the routing. Soft time windows are incorporated into the routing to optimize the timeliness of the first-mile pickup and last-mile delivery services in intermodal transportation. The routing is further modeled in a time-dependent and fuzzy environment where the average truck speeds of the road depend on the truck departure times and are simultaneously considered fuzzy along with rail capacities. The fuzzy truck speed leads to the fuzziness of three aspects, including speed-dependent CO2 emissions of the road, a timetable-constrained transfer process from road to rail, and delivery time window violation. This study formulates the routing problem under the above considerations and carbon tax regulation as a combination of transportation path planning problem and truck departure time and speed matching problem. A fuzzy nonlinear optimization model is then established for the proposed routing problem. Furthermore, chance-constrained programming with general fuzzy measure is used to conduct the defuzzification of the model to make the problem solvable, and linearization techniques are adopted to linearize the model to enhance the efficiency of problem-solving. Finally, this study presents an empirical case to demonstrate the effectiveness of the designed approach. This case study evaluates the performance of carbon tax regulation by comparing it with multi-objective optimization. It also focuses on sensitivity analysis to discuss the influence of the optimistic–pessimistic parameter and confidence level on the optimization results. Several managerial insights are revealed based on the case study.

Timetable information in public transportation networks exhibit a large degree of redundancy; e.g. consider a bus going from station A to station B at 6:00, 6:15, 6:30, 6:45, 7:00, 7:15, 7:30, . . . , 20:00, the very same data can be provided by a frequency-based representation as ’6:00-20:00, every 15 minutes’ in considerably less space. Nevertheless a common graph model for routing in public transportation networks is the time-expanded representation where for each arrival/departure event a single node is created. We will introduce a frequency-based graph model which allows for a significantly more compact representation of the network, resulting also in a speed-up for station-to-station queries. Moreover we will describe a new variant of Dijkstra’s algorithm, where also the labels are frequency-based. This approach allows for accelerating profile queries in public transportation networks.

Water distribution for open-channel irrigation networks is more and more complex due to increasing constraints on water resources and changing demand patterns, whereas the performance of such systems is expected to increase. In this regard, an optimization approach is developed in order to schedule a fair scenario of water distribution among different users, where water demand is formulated in term of start time, duration and flow rate. This study investigates how to optimize the water distribution over a finite scheduling horizon while respecting the constraints linked to the system. The optimization approach forces the scheduled start time and the volume to be closer to the demanded ones, to minimize water losses and to reduce manpower. The constraints take into account the flow routing processes, the physical infrastructure, the available water resource, and the gate keeper timetable. The numerical resolution is done by using an optimization software IBM-Ilog Cplex. The method is then illustrated with the scheduling of off-take withdrawals for a typical traditional open-channel network: a lateral canal of the Gignac canal, in southern France.

Planning a journey by integrating route and timetable information from diverse sources of transportation agencies such as bus, ferry, and train can be complicated. A user-friendly, informative journey planning system may simplify a plan by providing assistance in making better use of public transportation. In this study, we presented the service-oriented, multimodel Intelligent Journey Planning System, which we developed to assist travelers in journey planning. We selected Izmir, Turkey, as the pilot city for this system. The multicriteria problem is one of the well-known problems in transportation networks. Our study proposes a gradual path-finding algorithm to solve this problem by considering transfer count and travel time. The algorithm utilizes the techniques of efficient algorithms including round based public transit optimized router, transit node routing, and contraction hierarchies on transportation graph. We employed Dijkstra’s algorithm after the first stage of the path-finding algorithm by applying stage specific rules to reduce search space and runtime. The experimental results show that our path-finding algorithm takes 0.63 seconds of processing time on average, which is acceptable for the user experience.

In this paper, we propose a two-stage robust optimization framework to evaluate widely controllable commuter flow strategies that can help mitigate uncertain disruption impacts on rail transit commuter flows. In the operation-as-usual stage, preemptive control strategies including timetable adjustment, commuter path choice diversion, and commuter trip starting time diversion are planned within budget and other requirement constraints. In the disruption stage, optimal contingency routing is derived to minimize disruption impacts. To this end, a linear programming model that simulates the commuter movement logic under train service and platform disruption events is developed, which is then integrated in a mixed-integer max-min optimization model to evaluate the worst-case impacts on commuter flows arising from a set of uncertain disruption scenarios. We show that the two-stage robust optimization framework can be solved by a cutting plane algorithm efficiently using high performance and parallel computing platforms. Finally, we demonstrate the application of the model in mitigating disruption impacts through computational studies based on an actual rail transit network.

To alleviate the problems of traffic congestion, excessive energy consumption, and the environmental pollution caused by private cars, it is essential to use public transportation (PT). However, passengers making multiple trips in a short time period must repeatedly make travel mode choices, purchase tickets, and wait for buses for each trip, which may negatively affect their preference for PT. In order to improve the attractiveness of PT, especially for passengers requiring multiple trips in a short time period, this paper proposes the one e-ticket customized bus service mode for passengers with multiple trips (OECBSM-PMT) by customized buses (CBs). Besides, a CB-routing optimization model for the OECBSM-PMT is also developed in this paper, formulated as a mixed-integer linear programming based on a vehicle routing problem with pickup and delivery and time windows (VRPPDTW). The model aims to maximize the profit and minimize the costs of operation with considering passengers with multi-trip requests, homogeneous CB fleets with pickup/delivery-time-window constraints, and mixed loads. A service effectiveness identification procedure based on genetic algorithm (GA) is proposed to cope with the calculation considering the characteristics of passengers with multiple trips. Finally, the proposed model and algorithm are verified and analyzed using the case of the 2022 Beijing Winter Olympic Games. It can be found from the results that the method can provide an optimized CB route plan and timetable, and the algorithm GA-I obtains better solutions than other solving strategies in most instances. The proposed OECBSM-PMT and corresponding optimized method can better adapt to diverse travel demands, significantly improve the convenience for passengers, especially those making multiple trips in a short time period and will eventually promote a higher level of public transport service.

Mathematical models for path planning and vehicle scheduling for logistic distribution of hazardous materials in full container load (FCL) are established, with their problem-solving methods proposed. First, a two-stage multiobjective optimization algorithm is designed for path planning. In the first stage, pulse algorithm is used to obtain the Pareto paths from the distribution center to each destination. In the second stage, a multiobjective optimization method based on Nondominated Sorting Genetic Algorithm II (NSGA-II) is designed to obtain candidate transport paths. Second, with analysis on the operating process of vehicles with hazardous materials in FCL, the vehicle scheduling problem is converted to Vehicle Routing Problem with Time Windows (VRPTW). A problem-solving method based on estimation of distribution is adopted. A transport timetable for all vehicles based on their transport paths is calculated, with participation of the decision-makers. A visual vehicle scheduling plan is presented for the decision-makers. Last, two examples are used to test the method proposed in this study: distribution of hazardous materials in a small-scale test network and distribution of oil products for sixteen gas stations in the main districts of Lanzhou city. In both examples, our method is used to obtain the path selection and vehicle scheduling plan, proving that validity of our method is verified.

This research paper proposes a Lagrangian method to address the passing capacity of the calculation problem (PCCP) for a hub station in a high-speed railway (HSR) system. The passing capacity of a hub station is critical for determining the train timetable and maximizing the number of trains that can operate on different lines. The objective of this study is to determine the maximum number of trains that can pass through, start at, or end at a hub station. To achieve this objective, a mathematical model was introduced to solve the PCCP. The model was decomposed into two parts using a Lagrangian relaxation algorithm. The first part of the model was a simple train arrival problem (TAP) that reflected the timing of trains at the hub station with simultaneous arrival and departure time constraints. The second part of the model was a train spatio-temporal routing problem (TSRP) that aimed to solve the shortest spatio-temporal path of trains with free conflict with the train’s trajectory. A real instance was provided to demonstrate the feasibility of the proposed approach and the effectiveness of the Lagrangian method. The results showed that the proposed method can efficiently solve the PCCP and maximize the passing capacity of a hub station in an HSR system.

The study considered the role of passenger road transport as one of the most important sectors of the national economy, which influences the entire economy of a country and its regions, as well as the quality of life of the population.The analysis of the transport system in the city of Khujand, which is mainly dominated by road transport, has been carried out based on the results of the conducted survey on passenger flows on bus routes of the city, particularly, regarding origin-destination matrix, fare collectability.The conclusions argue in favour of practicability of conducting regular systematic monitoring of passenger flows to optimize suggestions in the field of urban public transport development. In fundamental terms, main problems of passenger transportation management were identified including lack of a regular timetable on certain routes, non-compliance with the traffic schedule, resulting in an increase in travel time, changes in routing due to the absence of sufficient number of passengers, systematic violations of traffic rules, excessively long stops at the hub stopping points, etc. The suggestions comprise approaches intended to reduce influence of organisational and managerial factors on efficiency of passenger transportation, on the correct choice of rolling stock, that should be selected considering design features, possibility of serving all segments of the population (categories of passengers), traffic intensity, manoeuvrability, compliance with road conditions, etc. Conclusions were also made regarding techniques to justify the volume of passenger transportation, to identify average distance of passenger’s trip, to calculate technical, operational, and quality indicators of operation of public transport, distribution of passengers per routes.The analysis of the structure of passenger flows since it influences the indicators of the effectiveness of passenger transportation, plays the most significant role in the framework of development of new approaches to the solution of transport issues in the city of Khujand.Implementation of full-scale monitoring of passenger flows will make it possible to develop appropriate timetables facilitating movement of passenger flows on routes, to select a rational type of rolling stock in terms of capacity, will contribute to time-saving passenger travelling, socialisation of transport tariffs, and improved quality of transportation.

Objective Since the 1990s, almost all healthcare organisations have had electronic health records (EHR) to organise and manage treatment, care and work routines. This article aims to understand how healthcare professionals (HCPs) make sense of digital documentation practice. Methods Based on a case study design, field observations and semi-structured interviews were conducted in a Danish municipality. A systematic analysis based on Karl Weick's sensemaking theory was applied to investigate what cues HCPs extract from timetables in the EHR and how institutional logics frame the enactment of documentation practice. Results The analysis uncovered three themes: making sense of planning, making sense of tasks and making sense of documentation. The themes illustrate that HCPs make sense of the digital documentation practice as a dominant managerial tool designed to control resources and work routines. This sensemaking leads to a task-oriented practice which centres on delivering fragmented tasks according to a timetable. Conclusion HCPs mitigate fragmentation by responding to a care professional logic, where they document to share information and carry out invisible work outside of timetables and scheduled tasks. However, HCPs are focused on solving specific tasks by the minute with the possible consequence that continuity and their overview of the service user's care and treatment disappear. In conclusion, the EHR system eliminates a holistic view of care trajectories, leaving it up to HCPs to collaborate in an effort to obtain continuity for the service user.

The importance of chronology is reasserted as a means to achieving history and a sense of temporality. A range of current methods for estimating the dates and durations of archaeological processes and events are considered, including visual inspection of graphs and tables of calibrated dates and the summing of the probability distributions of calibrated dates. These approaches are found wanting. The Bayesian statistical framework is introduced, and a worked example presents simulated radiocarbon dates as a demonstration of the explicit, quantified, probabilistic estimates now possible on a routine basis. Using this example, the reliability of the chronologies presented for the five long barrows considered in this series of papers is explored. It is essential that the ‘informative’ prior beliefs in a chronological model are correct. If they are not, the dating suggested by the model will be incorrect. In contrast, the ‘uninformative’ prior beliefs have to be grossly incorrect before the outputs of the model are importantly wrong. It is also vital that the radiocarbon ages included in a model are accurate, and that their errors are correctly estimated. If they are not, the dating suggested by a model may also be importantly wrong. Strenuous effort and rigorous attention to archaeological and scientific detail are inescapable if reliable chronologies are to be built. The dates presented in the following papers are based on models. ‘All models are wrong, some models are useful’ (Box 1979, 202). We hope readers will find them useful, and will employ ‘worry selectivity’ to determine whether and how each model may be importantly wrong. The questions demand the timetable, and our prehistories deserve both.

In an urban shuttle system, shuttle buses need to pick up passengers waiting at predetermined stops according to their planned schedules (routes and timetables). However, in practice, passenger demand is unstable and has fluctuations, which means that passenger demand at a specific stop is likely to increase or decrease, causing low service quality, long passenger waiting times, and imbalanced utilization of bus capacity. Therefore, we introduce the shuttle bus rerouting and rescheduling strategy, based on which the operator can change the visited stops and arrival times of the shuttle buses and can operate backup buses to handle the passenger demand fluctuations. A three-dimensional space-time-state network is formulated to depict shuttle routes, timetables, and passenger-loading states, and the proposed problem can be formulated as a multicommodity network-flow optimization problem. To solve the model efficiently, we adopt the alternating direction method of multipliers (ADMM) decomposition method to decompose the original problem into several single shuttle routing subproblems. We test the model and algorithm in the 9-node network with three stops, and a larger scale Chicago sketch network is also adopted to demonstrate the effectiveness and efficiency of the proposed model and algorithm. The rerouting and rescheduling results for the Chicago case represent a 5.7% improvement relative to the results with the planned schedules.

A rescheduling algorithm for trains on a single-track railway was developed in case of disturbances that would cause conflicts between trains. This algorithm is based on mixed integer linear programming (MILP) with speed-up routines. The model considers station capacities explicitly (i.e., the number of available tracks for meeting and overtaking operations). Because the model is too hard for the solvers (CPLEX in this study) to tackle, three speed-up routines were devised when rescheduling trains. These routines are a greedy heuristic to reduce the solution space, using the lazy constraint attribute of the solver and a multiobjective approach to find a good initial feasible solution that conforms to actual railway operation. The algorithm was tested on a hypothetical rail line for different sizes of timetable instances with disturbed trains in a maximum two-hour time horizon. It managed to solve the hardest instances within a three-minute time limit thus minimizing the total weighted delay of rescheduled trains. The optimality gap metric is used to show the effectiveness and efficiencies of the speed-up heuristics developed.

The increase and diversity of low-cost air quality (AQ) sensors, as well as their flexibility and low power consumption, offers us the opportunity to integrate them into broad AQ wireless sensor networks, with the aim of enabling real-time monitoring and higher spatial sampling density of pollution in all parts of cities. Considering that the vast majority of the population lives in cities and the increase in respiratory/allergic problems in a large part of the population, it is of great interest to offer services and applications to improve their quality of life by avoiding pollution exposure in their movements in the open air. In the ECO4RUPA project, we focus on this kind of service, proposing an inclusive and intelligent routing ecosystem carried out using a network of low-cost AQ sensors with the support of 5G communications along with official AQ monitoring stations, using spatial interpolation techniques to enhance its spatial resolution. The goal of this service is to calculate healthy walking and/or cycling routes according to the particular citizen’s profile and needs. We provide and analyse the results of the proposed route planner under different scenarios (different timetables, congestion road traffic, and routes) and different user profiles, with a special interest in citizens with asthma and pregnant women, since both have special needs. In summary, our approach can lead to an approximately average reduction in pollution exposure of 17.82% while experiencing an approximately average increase in distance travelled of 9.8%.

In January 1973, American Telephone & Telegraph, then the world's largest private-sector employer, entered into a Consent Decree with the United States Equal Employment Opportunity Commission. In this decree, following a fourteen-month dispute before the Federal Communications Commission,at&tagreed to implement specific goals and timetables for hiring women in traditionally male jobs, men in traditionally female jobs, and minorities in jobs in which they had been traditionally underrepresented.at&t's adoption of affirmative action immediately preceded the routine application of affirmative action hiring and promotion policies in large, private-sector U.S. firms regardless of federal contractor status. Nonetheless, the importance ofat&t's action remains misunderstood by critics and supporters of affirmative action alike.

Advanced traveler information systems provide travelers with pre-trip and en route travel information necessary to improve the trip decision making process based on various criteria (e.g., avoiding the negative impacts of traffic congestion, selecting specific travel modes, etc.). This study investigates an adaptive routing methodology for multimodal transportation networks. To integrate transit networks, the model takes into account both the predefined timetables of public transportation services and the variability of travel times. A graph theory based methodology is proposed to capture travel behavior within a multimodal network. The study advances a routing algorithm based on Markov decision processes. Special network modeling elements were defined to allow the developed algorithm to select the most efficient transportation mode at each junction along a given route. The proposed methodology is applied to a small real-world network located in the central business district area of Montreal, Quebec. The network includes bus, subway, and bicycle transportation facilities. The simulations were run under the assumption that users do not use private vehicles to travel between arbitrary selected origin and destination points. The developed routing algorithm was applied to several simulation scenarios. The results identified what is the most efficient combination of transportation modes that the travelers have to use given certain traffic and transit service conditions. Larger and more complex networks of motorized and non-motorized modes with stochastic properties will be investigated in subsequent work.

In recent years registrars on psychiatric training rotations have been encouraged to begin their research careers early. Most of them are in such (training posts) for three and a half years. A few with extensive previous experience in other areas of medicine will be in post for less than this. The usual pattern of work with such schemes is to change both posts and accompanying routine every six months. At no point during this time will they have time allocated for research per se unless they are a fortunate member of some of the training rotations which include this in the weekly timetable. Such time has to be begged, stolen or borrowed from the hapless consultant who is all too aware of the service shortfall in his or her own area. If the registrar is fortunate enough to find an accommodating senior, this may not be the situation in his or her next post, which renders long term research well nigh impossible.

We led an investigation to decide if hypo fractionated 35-days timetable of entire breast radiation is pretty much as viable. Women who bearing obtrusive breast carcinoma had gone through breast monitoring a medical procedure and resection edges were clean and partially lymph hubs were negatively approached with haphazardly relegated to get entire bosom illumination either at a control portion of 50 Gy in 15 divisions over a time of 45 days or at a portion of 45.5 Gy in 12 parts over a time of 22 days (the hypo fractionated-radiation bunch). The repetition at 36 months were 7.2% among the 301 ladies allocated to standard illumination as contrasted and 7.6% among the 312 ladies allocated to the hypo fractionated routine. At 36 months, 69.5% of ladies in the benchmark group as contrasted and 71.2% of the ladies in the hypo fractionated-radiation bunch had a decent or astounding restorative result. 3 years after therapy, sped up, hypo fractionated entire breast illumination was not sub-par compared to standard radiation therapy in ladies who had gone through breast preserving a medical procedure for obtrusive bosom malignant growth with clear careful edges what's more, negative axillary hubs. The ideal fractionation plan for entire bosom light after bosom rationing medical procedure is obscure.

Enough sleep is crucial for physical and emotional growth of kids and students. It has been noted that there is a progressive decline in bedtime as kids turn into teens, despite the fact that the need for sleep among students does not decrease. Teenagers need for sleep has been estimated as much as 9.2 h per day. Poor sleep has actually been noted to lead to poor diet regimen, excessive weight, stunted growth, psychological health concerns, as well as chemical abuse. Much as the need for sleep is an individual particular, approximately at least 8.3 hrs. of rest per evening is recommended for teens, to avoid excessive daytime drowsiness. High quality sleep is necessary for young professional athletes for making sure much better performance in psychomotor as well as cognitive activities, and for minimizing the chances of creating challenging factors for musculoskeletal discomfort. Detection of sleep disorders in adolescent complaining of sleeplessness is a day-to-day challenge for doctors and clients alike. The purpose of the research study was to assess the prevalence of sleep hygiene awareness, practices and quality among elementary schools students in Canada. The study was a literature based. The research discovered that a boost in the occurrence of difficulty in getting sleep and in too much screen time exposure and marginal increase in physical activity levels. In addition, teens exceeding 2-h everyday display time had 20% higher probabilities of reporting sleep-onset problems, while no association was discovered for physical activity. The study also discovered that a regular every night routine aids the body recognize that it is going to bed; this could consist of taking warm shower or bathroom, checking out a publication, or light stretches. Whenever feasible it is essential for the students to try to avoid emotionally distressing conversations and activities before attempting to sleep considering that maintaining a routine sleep timetable also on weekends keeps the timing of the body's body clock and also can aid you fall asleep and wake up much more quickly. Based on the finding, the research study concluded that the daily substances that students take, the medicines one takes, how long they sleep in a day and exactly how they choose to invest their nights can considerably influence their quality of sleep. Also a couple of mild adjustments can, in many cases indicate the difference between sound rest as well as a restless evening. Finishing a two-week rest diary can help one understand how their routines impact their sleep. The study suggested that teenagers must reserve no more than eight hrs. For sleep given that the suggested quantity of sleep for a healthy grownup goes to least 7 hrs. Keywords: Sleep Hygiene, Awareness, Sleep Quality, Sleep Disorder, Students

There are well-known specifics of ro-pax ferry shipping, such as the time factor as a consequence of keeping a regular timetable and the priority given to minimizing heeling, pitching, and rolling caused by maximum focus on passenger comfort and ro-ro cargo safety. It is also extremely important to control the ferry’s fuel consumption, being one of the most important cost components. The aim of the article is to draw the attention of shipping company managers to the great potential that lies in the use of routine operational data, collected exclusively on board the ferries. It is worth noting that the research in this paper is based on standard office software packages rather than advanced statistical methods of data analysis, which are usually not accessible for shipping managers. Contrary to typical ocean-going vessels, there are a number of factors that need to be taken into consideration when analyzing ro-pax ferry fuel consumption. Moreover, these factors occur, in many cases, accidentally and, thus, they are difficult to observe on board the ferry without utilizing expensive and time-consuming methods. The possibility of fuel control is important not only for economic reasons but also due to air pollution caused by engine exhausts. The article presents an estimation of increased fuel consumption caused by the degradation of the hull silicone anti-fouling coating. The presented estimations of fuel consumption may be treated as the base for calculations of the economic effectiveness of ferries. The attempt to resolve the above-mentioned problem was made on the basis of research on a real ferry, which took place on the Świnoujście-Trelleborg line between 2007 and 2019.

The paper, based on publications and scientific research of Lithuanian and foreign authors, presents the actual of health status and physical activity of young people. Scientific evidence has become compelling that a sedentary lifestyle carries a risk for the development of coronary artery disease, obesity, hypertension, and other chronic diseases of adulthood. These problems manifest during adulthood, they are lifelong processes with origins in pediatric years. Socialization processes and motivational factors should be emphasized to promote actine lifestyles among the young. The aim of the study to research pupils‘ physical activity and health at V-XI forms of the Basanavičiaus secondary school in Vilnius. The tasks of the study were to investigate the scientific, pedagogical and medical literature on the chosen topic, to examine pupils‘ mental and physical working capacity per day and per week, to evaluate physical activity during leisure time and to find out the causes of the physical passivity. The methods of investigation. The following methods for the accomplishment of the study were used The analysis of the literary sources (pedagogical, sociological, medical). Pedagogical–sociological methods: questionanaire survey, interview, pedagogical experiment. Statistical analysis. Conclusion Mental working capacity is influented by the following factors: the teaching methodsmaterial, process of promotion, the organisation of the pupils daily routine, school anxiety, support within the family, rest, addcharge during the lesson. It was established that different factors influence pupils‘ physical activity. The most important being the school conditions, aims of the activity and value orientations through wich the social system regulates the behaviour of the personality. Pedagogical factors are also very important: daytime table, leisure, business. The task of the school is to organize the learning process: to create a balance between intellectual and physical activities, to create a timetable wich satisfies both the need for exersise and learning. Key words: physical activity, health, social and pedagogical conditions, motivation.

Purpose This study aims to compare styles of management accounting (MA), i.e. the way in which MA influences corporate decision-making, in German and Spanish companies. The study illustrates relevant differences by comparing the role of management accountants in decision-making processes and puts a particular emphasis on their networking activities in a corporate context. Design/methodology/approach This study builds on field study data from semi-structured interviews with senior management accountants in German and Spanish companies. The authors analyze the data within the framework of the actor-network theory (ANT). Findings In the sampled German companies, strong networks between management accountants and other corporate functions have been established, whereas the corresponding Spanish networks are emerging but remain fragile because of interference from anti-programs, mistrust and defensive departmental attitudes. Although MA in Spain has established only few accepted routines and remains distant from managerial decision-making, it enjoys an unquestioned standing in the German companies, because its routines and procedures are embedded into corporate culture. This embedding is facilitated by not only information technology but also relatively simple tools such as templates, timetables and standardized agendas. Research limitations/implications The present study underlines how combining the field study approach with rationales from ANT can provide relevant insights into MA practices in its corporate context. Practical implications The present study provides guidance for management accountants striving for an increased influence on corporate decision-making and an improved collaboration with corporate management. Originality/value The authors extend the traditional spectrum of theoretical approaches in comparative MA studies. The ANT lens allows to show how styles of MA are shaped by interdependencies between institutional settings and networking processes. In this way, this paper complements previous cross-country research, which has mainly relied on contingency theory to examine static, country-specific differences in relation to distinct environmental and cultural conditions.

Background The acute hospital setting has become a key site of care for people living with dementia. People living with dementia are one of the largest populations in our hospitals, with the Department of Health and Social Care recognising that 25–50% of all acute hospital admissions are people who are also living with dementia. However, people living with dementia are a highly vulnerable group in the hospital setting and, following an acute admission, their functional abilities can deteriorate quickly and significantly. Detailed research is required to explore what constitutes ‘good care’. Objectives This study’s focus was a common, but poorly understood, aspect of everyday care for people living with dementia during an acute admission, that is continence care. We asked the following questions: what caring practices are observable when interacting with this patient group? How do ward teams respond to and manage continence needs? What informs these approaches? What are staff doing and why? Design This ethnography was informed by the symbolic interactionist research tradition, focusing on understanding how action and meaning are constructed within a setting. In-depth evidence-based analysis of everyday care enabled us to examine how ward staff responded to the continence care needs of people living with dementia and to follow the consequences of their actions. We carried out a mixed-methods systematic narrative review to refine our approach to fieldwork and analysis. Setting This ethnography was carried out for 180 days, across 12 months, in six wards in three hospitals across England and Wales that were purposefully selected to represent a range of hospital types, geographies and socioeconomic catchments. Participants In addition to general observations, 108 individuals participated directly in this study, contributing to 562 ethnographic interviews. Ten detailed case studies were also undertaken with people living with dementia. Results This study identified ‘pad cultures’ as an embedded practice on these acute wards. The routine use of continence pads among people living with dementia (regardless of continence and independence) was widespread. The use of continence pads was viewed as a precautionary strategy, the rationale being to provide safeguards, ensure containment and prevent ‘accidents’ or incontinence episodes, with an expectation that patients living with dementia not only will wear pads, but will use them. Conclusions These ‘pad cultures’ enabled the number of unscheduled interruptions to the institutionally mandated timetabled work of these wards to be reduced, but had significant impacts on people living with dementia and, in turn, wider consequences for these individuals and their identities. Ward staff described feeling abandoned with the responsibility of caring for large numbers of people living with dementia, believing that it was impossible to work in other ways to support their patient’s continence. Limitations The limitations identified included the potential for the Hawthorne effect to influence data collection. Future work In collaboration with a specialist dementia care and continence teams, the findings are informing the development of education and training at the interactional and organisational level. Study registration This study is registered as PROSPERO CRD42018119495. Funding This project was funded by the National Institute for Health and Care Research (NIHR) Health and Social Care Delivery Research programme and will be published in full in Health and Social Care Delivery Research; Vol. 10, No. 14. See the NIHR Journals Library website for further project information.

AbstractClassic models to derive a timetable for public transport often face a chicken-and-egg situation: A good timetable should offer passengers routes with small travel times, but the route choice of passengers depends on the timetable. While models that fix passenger routes were frequently considered in the literature, integrated models that simultaneously optimize timetables and passenger routes have seen increasing attention lately. This creates a growing need for a set of instances that allows to test and compare new algorithmic developments for the integrated problem. Our paper addresses this requirement by presenting TimPassLib, a new benchmark library of instances for integrated periodic timetabling and passenger routing.

This paper studies the real-time trains routing and platforming problem (RT-TRPP) in railway stations that arises from the unreliable arrival times of freight trains, flexible shunting operations and dynamic station layout caused by equipment failure. The feasibility of station timetable is checked before preparing a route for a train or after updating the station layout. If the station timetable is infeasible, the reassignment of trains is triggered. After introducing a problem formulation for the RT-TRPP, we propose an Integer Linear Program (ILP) that strives to minimize the number of conflicting trains. In resulting timetable, directions, arrival and leaving time remain the same with networks timetable to prevent traffic disturbance of neighboring territories. If the resulting timetable is still infeasible, conflicting trains are pointed out with the cause analysis. The method is tested on real-world complex station which receives always the overload of trains’ activities. The optimal full-day solution of 249 trains is obtained within 2 seconds. The efficiency of this method meets the time-critical nature of RT-TRPP.

The uncertainty of transportation duration between nodes is an inherent characteristic and should be concerned in the routing optimization of the multimodal transportation network to guarantee the reliability of delivery time. The interval number is used to deal with the uncertainty of transportation duration, and the multi-objective robust optimization model is established which covers the transportation duration and the cost. To solve the combinatorial optimization problem of this study, Non-Dominated Sorting Genetic Algorithm-II (NSGA- II ) is designed, which integrates the (μ+λ) selection method elite retention and the external filing elite retention. Our findings verify the efficiency of the proposed approach by analyzing the diversity, distribution and convergence of the frontier solutions. Finally, near-optimal solutions are obtained with the proposed algorithm in the numerical example. The present study can provide decision reference for multimodal transportation carriers in making transportation plan under uncertainty.

This paper provides a deeper insight into the train platforming problem (TPP). Many studies have focused on different versions of train scheduling and routing problems, and most of them assume that the platform track’s capacity is one train. However, especially in busy and complex railway stations, most platform tracks are divided into two parts, allowing two trains to simultaneously share the same platform track for passenger boarding/alighting. This results in more efficient train assignment to the platform tracks. In addition, consideration of the track capacity makes the problem more difficult because directions of trains are problematic. Motivated by this challenge, we consider the TPP with two-train-capacity tracks. We first describe the problem in detail and then propose a mixed-integer programming model. The objective of the considered problem is to minimize the total weighted train delays, which are defined as the difference between the departure times calculated by the mathematical model (M1) and the scheduled departure times of the trains in the timetable. Because of the NP-hard nature of the problem, the proposed M1 may not find feasible solutions for large-size problems. Thus, a matheuristic algorithm (MA) is developed to solve large-size problems. We used randomly generated test problems to demonstrate the performance of the proposed M1 and MA. Experimental results showed that MA outperforms M1 in both solution quality and solution time. Additionally, a case study was conducted at the central station of Prague, Czechia.

AbstractWith the advent of improved aircraft situational awareness and the need for airlines to reduce their fuel consumption and environmental impact whilst adhering to strict timetables, fixed-time, fuel-optimal routing is vital. Here, the aircraft trajectory planning problem is addressed using optimal control theory. Two variants of a finite horizon optimal control formulation for fuel burn minimization are developed, subject to arrival constraints, an aerodynamic fuel-burn model, and a data-driven wind field. In the first variant, the control variable is expressed as a set of position-dependent aircraft headings, with the optimal control problem solved through a reduced gradient approach at a range of fixed airspeeds. The fuel optimal result is taken as the lowest fuel use recorded. In the second variant, both heading angle and airspeed are controlled. Results from three months of simulated flight routes between London and New York show that permitting optimised en-route airspeed variations leads to fuel savings of 0.5% on an average day (and up to 4% on certain days), compared with fixed airspeed flights. We conclude that significant fuel savings are possible if airspeeds are allowed to vary en route to take optimal advantage of the wind field.

Abstract Bus driving is a complex and cognitively challenging task that places high demands on bus drivers’ working memory. Increasing use of “In-Vehicle Information Systems” leads to driver distraction and is a contributing factor to many road accidents globally, and with systems for tickets, navigation, and timetables, bus drivers are more exposed to this additional workload than other actors in the traffic. This study provides insights into how bus drivers’ driving behavior is affected by auditory traffic information through a driving simulator study at the Swedish National Road and Transport Research Institute. A pre-study showed that many bus drivers in Gothenburg experience that a majority of the messages they receive are irrelevant to them. Difference in driving behavior was identified for conditions in which the drivers received messages irrelevant to their route, which might indicate that irrelevancy is an important factor for the workload imposed to the drivers. We hypothesize that irrelevant messages require processing in the visuospatial sketchpad, which might increase workload more than just auditory information processing. The results of this study implies that the routines for traffic communication between traffic controllers and bus drivers should be considerate, as to reduce the number of irrelevant messages that are cognitively loading the bus drivers.

Changes in the supply and use of dimension stone have extensively modified the approach of the engineering geologist to stone technology. Traditional expertise requirements have moved from exploration, extraction, and processing to quality control and application. Reasons for this are the globalisation of dimension stone supplies from new and unknown sources; deterioration of environmental conditions; cost saving in using thin stone tiles or slabs as veneer; at times hazardous; incorrect cladding applications, and the assessment of weathering. All these require the knowledge and experience of the engineering geologist, whose skills are not commonly known. Promotion, assisted in the media by exposure of global hazards has drawn attention to the discipline and practices. Research on the physical and mechanical stone properties has at last been taken up by major intergovernmental organisations. Large budgets are devoted to take stone testing out of century old routine."High tech" facilities are now applied to make stone-related evaluations more objective and independent of the human factor. Acceptance criteria of testing results require rationalisation. Geotechnical knowledge is important to keep test results within economic restraints and timetables. This is of special importance when linking such factors to environmental planning and control of quarrying and subsequent rehabilitation of the workings. In this paper a bird's eye view of the problems related to dimension stones is provided. Some examples of research trends are also given to exhibit the state-of-the-art.

This article makes a case for the everyday while on tour and argues that the ability to continue with everyday routines and social relationships, while at the same time moving through and staying in liminal or atypical zones of tourist locales, is a key part of some kinds of tourist experience. Based on ethnographic field research with grey nomads (retirees who take extended tours of Australia in caravans and motorhomes) everyday life while on tour is examined, specifically the overlap and intersection between the out-of-the-ordinary “tourist zone” and the ordinariness of the “everyday zone.” The “everyday zone” and “tourist zone” can be readily differentiated by their obvious geospatial boundaries (being at home or being away on holiday). More specifically, the “everyday zone” refers to the routines of quotidian life, or the mundane practices which make up our daily, at-home lives. These practices are closely connected with the domestic realm and include consumption practices (clothing, cooking, mass media) and everyday social interactions. The “tourist zone” is similarly concerned with consumption. In this zone, however, tourists are seen to consume places; the culture, landscape, and peoples of exotic or out-of-the-ordinary tourist locales. Needless to say this consumption of place also includes the consumption of services and objects available in the tourist destinations (Urry, “The Consuming of Place” 220). The notion of tourists being away from home has often been contrasted with constructions of home—with the dull routines of everyday life—by social scientists and tourist marketers alike in an effort to illuminate the difference between being “away” and being at “home.” Scott McCabe and Elizabeth Stokoe suggest that peoples’ notion of “home” takes into account the meaning of being away (602). That is to say that when people are away from home, as tourists for example, they often compare and contrast this with the fundamental aspects of living at home. Others, however, argue that with the widespread use of mobile communication technologies, the distinction between the notion of being at “home” and being “away” becomes less clear (White and White 91). In this sense, the notion of home or the everyday is viewed with an eye towards social relationships, rather than any specific geographical location (Jamal and Hill 77–107; Massey 59–69; Urry, “The Tourist Gaze” 2–14; White and White 88–104). It can be argued, therefore, that tourism entails a fusion of the routines and relationships associated with the everyday, as well as the liminal or atypical world of difference. This article is based on semi-structured interviews with 40 grey nomads, as well as four months of ethnographic fieldwork carried out in rural and remote Australia—in Western Australia, the Northern Territory, and South Australia. Grey nomads have been part of Australian senior culture for at least four decades. They are a relatively heterogeneous group of tourists encompassing a range of socio-economic backgrounds, preferred activities, health status, and favoured destinations (Davies et al. 40–1; Economic Development Committee 4; Holloway 117–47), as well age cohorts—including the frugal generation (1910–1932), the silent generation (1931–1946), and the baby boomer generation (1946–65). Grey nomads usually tour as spousal couples (Tourism Research Australia 26; Onyx and Leonard 387). Some of these couples live solely on government pensions while others are obviously well-resourced—touring in luxury motorhomes costing well over half a million dollars. Some prefer to bush camp in national parks and other isolated locations, and some choose to stay long term in caravan parks socialising with other grey nomads and the local community. All grey nomads, nonetheless, maintain a particularly close link with the everyday while touring. Mobile communication technologies anchor grey nomads (and other tourists) to the everyday—allowing for ready contact with existing family and friends while on tour. Grey nomads’ mobile dwellings, their caravans and motorhomes, integrate familiar domestic spaces with a touring life. The interior and exterior spaces of these mobile dwellings allow for easy enactment of everyday, domestic routines and the privatised world of adult spousal relationships. This peripatetic form of dwelling, where the dwelling itself accommodates both travel and an everyday domestic life further blurs the distinctions between the “everyday zone” and the “tourist zone”. In this sense grey nomads carry out a lifestyle that is both anchored and mobile; anchored in the everyday domestic life while at the same time being nomadic or geographically unstable. This blurring of the boundaries between the “everyday zone” and “tourist zone” is attractive to senior tourists, offering them a relatively safe and comfortable incursion into tourist locales, where established routines and patterns of everyday life can be maintained. Other homes-away-from-homes such as serviced apartments, holiday homes and house swaps also offer greater connection to the everyday, but are geographically anchored to specific tourism spaces. The caravan or motorhome allows this at-home connection for the peripatetic tourist offsets the relative rigours of outback touring in remote and rural Australia. Everyday Social Relationships in the “Tourist Zone” When tourists go away from home, they are usually thought of as being away from both place (home) and relationships (family and friends). Nowadays, however, being away from home does not necessarily mean being away from family and friends. This is because the ease and speed of today’s telecommunication technologies allows for instantaneous contact with family and friends back home—or the virtual co-presence of family and friends while being away on tour. In the past, those friends and relations who were geographically isolated from each other still enjoyed social contact via letters and telegrams. Such contacts, however, occurred less frequently and message delivery took time. Long distance telephone calls were also costly and therefore used sparingly. These days, telecommunication technologies such as mobile phones and the Internet, as well as the lower cost of landline phone calls, mean that everyday social contact does not need to be put on hold. Keeping in contact is now a comparatively fast, inexpensive, and effortless activity and socialising with distant friends and relatives is now a routine activity (Larsen 24). All grey nomads travel with a mobile phone device, either a digital mobile, Next G or satellite phone (Obst, Brayley and King 8). These phones are used to routinely keep in contact with family and friends, bringing with them everyday familial relationships while on tour. “We ring the girls. We’ve got two daughters. We ring them once a week, although if something happens Debbie [daughter] will ring us” (Teresa). Grey nomads also take advantage of special deals or free minutes when they scheduled weekly calls to family or friends. “I mainly [use] mobile, then I ring, because I’ve got that hour, free hour” (Helen). E-mail is also a favoured way of keeping in contact with family and friends for some grey nomads. This is because the asynchronicity of e-mail interaction is very convenient as they can choose the times when they pick up and send messages. “Oh, thank goodness for the e-mail” (Pat). Maintaining social contact with family and friends at a distance is not necessarily as straightforward as when grey nomads and other tourists are at home. According to discussants in this study and the Regional Telecommunications Independent Review Committee, mobile phone coverage within Australia is still rather patchy when outside major metropolitan areas. Consequently, the everyday task of kin keeping via the phone can be somewhat intermittent, especially for those grey nomads who spend a great deal of time outside major towns in rural and remote Australia. “You can never get much [reception] but [...] they can just ring the mobile and just leave a message and we will get that message [later]” (Rena). Similarly, using the Internet to e-mail family and friends and catch up with online banking can only be carried out when passing through larger towns. “I do it [using the Internet] like every major town we went through. I’d stop and do a set of e-mails and I used to do my banking” (Maureen). The intermittent phone coverage in remote and rural Australia was not always viewed as an inconvenience by discussants in this study. This is because continuing engagement with family and friends while on tour may leave little respite from the ongoing obligations or any difficulties associated with family and friends back home, and encroach on the leisure and relaxation associated with grey nomad touring. “I don’t want the phone to ring […] That’s one thing I can do without, the phone ringing, especially at 4:00 in the morning” (Rena). In this way, too much co-presence, in the form of mobile phone calls from family and friends, can be just as much a nuisance when away from home as when at home—and impinge on the feeling of “being away from it all.” Naomi White and Peter White also suggest that “being simultaneously home and away is not always experienced in a positive light” (98) and at times, continued contact (via the phone) with friends and family while touring is not satisfying or enjoyable because these calls reiterate the “dynamics evident in those that are [usually] geographically proximate” (100). Thus, while mobile communication technologies are convenient tools for grey nomads and other tourists which blur the boundaries between the “everyday zone” and “tourist zones” in useful and pleasurable ways, their overuse may also encroach on tourists’ away time, thus interfering with their sense of solitude and quiescence when touring in remote or rural Australia. The “Everyday Zone” of the Caravan or Motorhome Being a tourist involves “everyday practices, ordinary places and significant others, such as family members and friends, but co-residing and at-a-distance” (Larsen 26). While tourism involves some sense of liminality, in reality, it is interspersed with the actuality of the everyday routines and sociabilities enacted while touring. Tim Edensor notes that; Rather than transcending the mundane, most forms of tourism are fashioned by culturally coded escape attempts. Moreover, although suffused with notions of escape from normativity, tourists carry quotidian habits and responses with them: they are part of the baggage. (61) Grey nomads go further than this by bringing on tour with them a domestic space in which everyday routines and sociabilities are sustained. Travelling in this manner “makes possible, and probably encourages, greater continuity with everyday routine than many other kinds of holiday making” (Southerton et al. 6). To be able to sleep in your own bed with your own pillow and linen, or perhaps travel with your dogs, makes caravanning and motorhoming an attractive touring option for many people. Thus, the use of caravans or motorhomes when travelling brings with it a great deal of mobile domesticity while on tour. The caravan or motorhome is furnished with most of the essentially-domestic objects and technologies to enable grey nomads to sleep, eat, relax, and be entertained in a manner similar to that which they enjoy in the family home, albeit within smaller dimensions. Lorna: We have shower, toilet. We had microwave, stereo. We have air conditioning and heating.Eric: Yeah, reverse cycle air conditioning.Lorna: Reverse cycle. What else do we have?Eric: Hot water service. Gas or 240 volt. 12 volt converter in that, which is real good, it runs your lights, runs everything like that. You just hook it into the main power and it converts it to 12 volt. Roll out awning plus the full annex.Lorna: Full annex. What else do we have? There’s a good size stove in it. The size of caravans and motorhomes means that many domestic tasks often take less time or are simplified. Cleaning the van takes a lot less time and cooking often becomes simplified, due to lack of bench and storage space. Women in particular like this aspect of grey nomad travel. “It is great. Absolutely. You don’t have toilets to clean, you don’t have bathrooms to clean. Cooking your meals are easier because everything is all […] Yeah. It’s more casual” (Sonya). This touring lifestyle also introduces new domestic routines, such as emptying chemical toilets, filling water tanks, towing and parking the van and refilling gas tanks, for example. Nonetheless grey nomads, spend significantly less time on these domestic tasks when they are touring. In this sense, the caravan or motorhome brings with it the comforts and familiarity of home, while at the same time minimising the routine chores involved in domestic life. With the core accoutrements of everyday life available, everyday activities such as doing the dishes, watching television, preparing and eating a meal—as well as individual hobbies and pastimes—weave themselves into a daily life that is simultaneously home and away. This daily life, at home in the caravan or motorhome, brings with it possibilities of a domestic routinised lifestyle—one that provides welcome comfort and familiarity when travelling and a retreat from the demands of sightseeing. On the farm I used to make jam and cakes, so I do it again [in the caravan]. I make jam, I made marmalade a couple of weeks ago. We’d often stay home [in the caravan], I’d just clean or do a bit of painting. (Jenny) Touring in a caravan or motorhome allows for some sense of predictability: that you own and control the private spaces of your own mobile dwelling, and can readily carry out everyday domestic routines and sociabilities. “We go for a long walk. We come back and we see friends and we stop and have a coffee with them, and then you come home in the caravan at 2.30 and you can still have lunch” (Yvonne). Touring in a caravan or motorhome also frees grey nomads from dependence on prearranged tourist experiences such as organised tours or hotel meal times where much of the tourist experience can be regimented. We always went in hotels and you always had to dress up, and you had to eat before a certain time, and you had your breakfast before a certain time. And after 2.30 you can’t have lunch anymore and sometimes we have lunch at 2 o’clock. I like the caravan park [better]. (Donald) Despite the caravan or motorhome having close links with everyday life and the domestic realm, its ready mobility offers a greater sense of autonomy while touring: that you are unfettered, not bound to any specific place or timetable, and can move on at whim. Grey nomads often cross paths with other tourists dependent on guided bus tours. “They go in [to Kakadu] on a bus trip. All they do is go in on the main road, they’re in there for the day and there’re back. That’s absolutely ridiculous” (Vance). This autonomy, or freedom to structure their own tourist experiences, allows grey nomads the opportunity to travel at a leisurely pace. Even those grey nomads who travel to the same northern destination every year take their time and enjoy other tourist locations along the way. We take our time. This time, last time, we did three weeks before we got in [to] Broome. We spent a lot [of time] in Karratha but also in Geraldton. And when we came back, in Kalbarri, [we had] a week in Kalbarri. But it’s nice going up, you know. You go all through the coast, along the coast. (John) Caravan or motorhome use, therefore, provides for a routinised everyday life while at the same time allowing a level of autonomy not evident in other forms of tourism—which rely more heavily on pre-booking accommodation and transport options. These contradictory aspects of grey nomad travel, an everyday life of living in a caravan or motorhome coupled with freedom to move on in an independent manner, melds the “everyday zone” and the “tourist zone” in a manner appealing to many grey nomads. Conclusion Theories of tourism tend to pay little attention to the aspects of tourism that involve recurrent activities and an ongoing connectedness with everyday life. Tourism is often defined: by contrasting it to home geographies and everydayness: tourism is what they are not. [...] The main focus in such research is on the extraordinary, on places elsewhere. Tourism is an escape from home, a quest for more desirable and fulfilling places. (Larsen 21) Nonetheless, tourism involves everyday routines, everyday spaces and an everyday social life. Grey nomads find that mobile phones and the Internet make possible the virtual co-presence of family and friends allowing everyday relationships to continue while touring. Nonetheless, the pleasure of ongoing contact with distant family and friends while touring may at times encroach on the quietude or solitude grey nomads experienced when touring remote and rural Australia. In addition to this, grey nomads’ caravans and motorhomes are equipped with the many comforts and domestic technologies of home, making for the continuance of everyday domiciliary life while on tour, further obfuscating the boundaries between the “tourist zone” and the “everyday zone.” In this sense grey nomads lead a lifestyle that is both anchored and mobile. This anchoring involves dwelling in everyday spaces, carrying out everyday domestic and social routines, as well as maintaining contact with friends and family via mobile communication technologies. This anchoring allows for some sense of predictability: that you own and control the private spaces of your own mobile dwelling, and can readily carry out everyday domestic routines and sociabilities. Conversely, the ready mobility of the caravan or motorhome offers a sense of autonomy: that you are unfettered, not bound to any specific place and can move on at whim. This peripatetic form of dwelling, where the dwelling itself is the catalyst for both travel and an everyday domestic life, is an under researched area. Mobile dwellings such as caravans, motorhomes, and yachts, constitute dwellings that are anchored in the everyday yet unfixed to any one locale. References Davies, Amanda, Matthew Tonts, and Julie Cammell. Coastal Camping in the Rangelands: Emerging Opportunities for Natural Resource Management. Perth: Rangelands WA, 2009. 24 Sep. 2011 ‹http://www.rangelandswa.com.au/pages/178/publications›. Economic Development Committee. Inquiry into Developing Queensland’s Rural and Regional Communities through Grey Nomad Tourism. Brisbane: Queensland Parliament, 2011. 23 Sep. 2011 ‹http://www.parliament.qld.gov.au/Documents/TableOffice/TabledPapers/2011/5311T3954.pdf›. Edensor, Tim. “Performing Tourism, Staging Tourism: (Re)Producing Tourist Space and Practice.” Tourist Studies 1 (2001): 59–81. Holloway, Donell. Grey Nomads: Retirement, Leisure and Travel in the Australian Context. PhD diss. Edith Cowan University: Perth, 2010. Jamal, Tanzin, and Steve Hill. “The Home and the World: (Post) Touristic Spaces of (in) Authenticity.” The Tourist as a Metaphor of The Social World. Ed. Graham Dann. Wallingford: CAB International, 2002. 77–107. Larsen, Jonas. “De-Exoticizing Tourist Travel: Everyday Life and Sociality on the Move.” Leisure Studies 27 (2008): 21–34. Massey, Doreen. “Power-Geometry and a Progressive Sense of Place.” Mapping the Futures: Local Cultures, Global Change. Eds. Jon Bird et al. London: Routeledge, 1993. 59–69. McCabe, Scott, and Elizabeth Stokoe. “Place and Identity in Tourists’ Accounts.” Annals of Tourism Research 31 (2004): 601–22. Obst, Patricia L., Nadine Brayley, and Mark J. King. “Grey Nomads: Road Safety Impacts and Risk Management.” 2008 Australasian Road Safety Research, Policing and Education Conference. Adelaide: Engineers Australia, 2008. Onyx, Jenny, and Rosemary Leonard. “The Grey Nomad Phenomenon: Changing the Script of Aging.” The International Journal of Aging and Human Development 64 (2007): 381–98. Regional Telecommunications Independent Review Committee. Regional Telecommunications Review Report: Framework for the Future. Canberra: RTIRC, 2008. Southerton, Dale, Elizabeth Shove, Alan Warde, and Rosemary Dean. “Home from Home? A Research Note on Recreational Caravanning.” Department of Sociology, Lancaster University. 1998. 10 Jan. 2009 ‹http://www.lancs.ac.uk/fass/sociology/papers/southerton-et-al-home-from-home.pdf›. Tourism Research Australia. Understanding the Caravan industry in WA: Grey Nomads—Fast Facts. Perth, Australia: Tourism WA (n.d.). Urry, John. “The Consuming of Place.” Discourse, Communication, and Tourism. Eds. Adam Jaworski and Annette Pritchard. Clevedon: Channel View Publications, 2005. 19–27. ———. The Tourist Gaze. London: Sage, 2002. White, Naomi, and Peter White. “Home and Away: Tourists in a Connected World.” Annals of Tourism Research 34 (2006): 88–104.

Diaspora This article looks at diaspora through the transformations of an established public service broadcaster, the BBC World Service, by considering some of the findings of the AHRC-funded Tuning In: Contact Zones at the BBC World Service, which is part of the Diasporas, Migration and Identities program. Tuning In has six themes, each of which focuses upon the role of the BBC WS: The Politics of Translation, Diasporic Nationhood, Religious Transnationalism, Sport across Diasporas, Migrating Music and Drama for Development. The World Service, which was until 2011 funded by the Foreign Office, was set up to cater for the British diaspora and had the specific remit of transmitting ideas about Britishness to its audiences overseas. Tuning In demonstrates interrelationships between the global and the local in the diasporic contact zone of the BBC World Service, which has provided a mediated home for the worldwide British diaspora since its inception in 1932. The local and the global have merged, elided, and separated at different times and in different spaces in the changing story of the BBC (Briggs). The BBC WS is both local and global with activities that present Britishness both at home and abroad. The service has, however, come a long way since its early days as the Empire Service. Audiences for the World Service’s 31 foreign language services, radio, television, and Internet facilities include substantive non-British/English-speaking constituencies, rendering it a contact zone for the exploration of ideas and political opportunities on a truly transnational scale. This heterogeneous body of exilic, refugee intellectuals, writers, and artists now operates alongside an ongoing expression of Britishness in all its diverse reconfiguration. This includes the residual voice of empire and its patriarchal paternalism, the embrace of more recent expressions of neoliberalism as well as traditional values of impartiality and objectivism and, in the case of the arts, elements of bohemianism and creative innovation. The World Service might have begun as a communication system for the British ex-pat diaspora, but its role has changed along with the changing relationship between Britain and its colonial past. In the terrain of sport, for example, cricket, the “game of empire,” has shifted from Britain to the Indian subcontinent (Guha) with the rise of “Twenty 20” and the Indian Premier League (IPL); summed up in Ashis Nandy’s claim that “cricket is an Indian game accidentally discovered by the English” (Nandy viii). English county cricket dominated the airways of the World Service well into the latter half of the twentieth century, but the audiences of the service have demanded a response to social and cultural change and the service has responded. Sport can thus be seen to have offered a democratic space in which new diasporic relations can be forged as well as one in which colonial and patriarchal values are maintained. The BBC WS today is part of a network through which non-British diasporic peoples can reconnect with their home countries via the service, as well as an online forum for debate across the globe. In many regions of the world, it continues to be the single most trusted source of information at times of crisis and disaster because of its traditions of impartiality and objectivity, even though (as noted in the article on Al-Jazeera in this special issue) this view is hotly contested. The principles of objectivity and impartiality are central to the BBC WS, which may seem paradoxical since it is funded by the Commonwealth and Foreign office, and its origins lie in empire and colonial discourse. Archive material researched by our project demonstrates the specifically ideological role of what was first called the Empire Service. The language of empire was deployed in this early programming, and there is an explicit expression of an ideological purpose (Hill). For example, at the Imperial Conference in 1930, the service was supported in terms of its political powers of “strengthening ties” between parts of the empire. This view comes from a speech by John Reith, the BBC’s first Director General, which was broadcast when the service opened. In this speech, broadcasting is identified as having come to involve a “connecting and co-ordinating link between the scattered parts of the British Empire” (Reith). Local British values are transmitted across the globe. Through the service, empire and nation are reinstated through the routine broadcasting of cyclical events, the importance of which Scannell and Cardiff describe as follows: Nothing so well illustrates the noiseless manner in which the BBC became perhaps the central agent of national culture as its cyclical role; the cyclical production year in year out, of an orderly, regular progression of festivities, rituals and celebrations—major and minor, civic and sacred—that mark the unfolding of the broadcast year. (278; italics in the original) State occasions and big moments, including those directly concerned with governance and affairs of state, and those which focused upon sport and religion, were a big part in these “noiseless” cycles, and became key elements in the making of Britishness across the globe. The BBC is “noiseless” because the timetable is assumed and taken for granted as not only what is but what should be. However, the BBC WS has been and has had to be responsive to major shifts in global and local—and, indeed, glocal—power geometries that have led to spatial transformations, notably in the reconfiguration of the service in the era of postcolonialism. Some of these massive changes have involved the large-scale movement of people and a concomitant rethinking of diaspora as a concept. Empire, like nation, operates as an “imagined community,” too big to be grasped by individuals (Anderson), as well as a material actuality. The dynamics of identification are rarely linear and there are inconsistencies and disruptions: even when the voice is officially that of empire, the practice of the World Service is much more diverse, nuanced, and dialogical. The BBC WS challenges boundaries through the connectivities of communication and through different ways of belonging and, similarly, through a problematisation of concepts like attachment and detachment; this is most notable in the way in which programming has adapted to new diasporic audiences and in the reworkings of spatiality in the shift from empire to diversity via multiculturalism. There are tensions between diaspora and multiculturalism that are apparent in a discussion of broadcasting and communication networks. Diaspora has been distinguished by mobility and hybridity (Clifford, Hall, Bhaba, Gilroy) and it has been argued that the adjectival use of diasporic offers more opportunity for fluidity and transformation (Clifford). The concept of diaspora, as it has been used to explain the fluidity and mobility of diasporic identifications, can challenge more stabilised, “classic” understandings of diaspora (Chivallon). A hybrid version of diaspora might sit uneasily with a strong sense of belonging and with the idea that the broadcast media offer a multicultural space in which each voice can be heard and a wide range of cultures are present. Tuning In engaged with ways of rethinking the BBC’s relationship to diaspora in the twenty-first century in a number of ways: for example, in the intersection of discursive regimes of representation; in the status of public service broadcasting; vis-à-vis the consequences of diverse diasporic audiences; through the role of cultural intermediaries such as journalists and writers; and via global economic and political materialities (Gillespie, Webb and Baumann). Tuning In thus provided a multi-themed and methodologically diverse exploration of how the BBC WS is itself a series of spaces which are constitutive of the transformation of diasporic identifications. Exploring the part played by the BBC WS in changing and continuing social flows and networks involves, first, reconfiguring what is understood by transnationalism, diaspora, and postcolonial relationalities: in particular, attending to how these transform as well as sometimes reinstate colonial and patriarchal discourses and practices, thus bringing together different dimensions of the local and the global. Tuning In ranges across different fields, embracing cultural, social, and political areas of experience as represented in broadcasting coverage. These fields illustrate the educative role of the BBC and the World Service that is also linked to its particular version of impartiality; just as The Archers was set up to provide information and guidance through a narrative of everyday life to rural communities and farmers after the Second World War, so the Afghan version plays an “edutainment” role (Skuse) where entertainment also serves an educational, public service information role. Indeed, the use of soap opera genre such as The Archers as a vehicle for humanitarian and health information has been very successful over the past decade, with the “edutainment” genre becoming a feature of the World Service’s broadcasting in places such as Rwanda, Somalia, Nigeria, India, Nepal, Burma, Afghanistan, and Cambodia. In a genre that has been promoted by the World Service Trust, the charitable arm of the BBC WS uses drama formats to build transnational production relationships with media professionals and to strengthen creative capacities to undertake behaviour change through communication work. Such programming, which is in the tradition of the BBC WS, draws upon the service’s expertise and exhibits both an ideological commitment to progressive social intervention and a paternalist approach drawing upon colonialist legacies. Nowadays, however, the BBC WS can be considered a diasporic contact zone, providing sites of transnational intra-diasporic contact as well as cross-cultural encounters, spaces for cross-diasporic creativity and representation, and a forum for cross-cultural dialogue and potentially cosmopolitan translations (Pratt, Clifford). These activities are, however, still marked by historically forged asymmetric power relations, notably of colonialism, imperialism, and globalisation, as well as still being dominated by hegemonic masculinity in many parts of the service, which thus represent sites of contestation, conflict, and transgression. Conversely, diasporic identities are themselves co-shaped by media representations (Sreberny). The diasporic contact zone is a relational space in which diasporic identities are made and remade and contested. Tuning In employed a diverse range of methods to analyse the part played by the BBC WS in changing and continuing social and cultural flows, networks, and reconfigurations of transnationalisms and diaspora, as well as reinstating colonial, patriarchal practices. The research deconstructed some assumptions and conditions of class-based elitism, colonialism, and patriarchy through a range of strategies. Texts are, of course, central to this work, with the BBC Archives at Caversham (near Reading) representing the starting point for many researchers. The archive is a rich source of material for researchers which carries a vast range of data including fragile memos written on scraps of paper: a very local source of global communications. Other textual material occupies the less locatable cyberspace, for example in the case of Have Your Say exchanges on the Web. People also featured in the project, through the media, in cyberspace, and physical encounters, all of which demonstrate the diverse modes of connection that have been established. Researchers worked with the BBC WS in a variety of ways, not only through interviews and ethnographic approaches, such as participant observation and witness seminars, but also through exchanges between the service, its practitioners, and the researchers (for example, through broadcasts where the project provided the content and the ideas and researchers have been part of programs that have gone out on the BBC WS (Goldblatt, Webb), bringing together people who work for the BBC and Tuning In researchers). On this point, it should be remembered that Bush House is, itself, a diasporic space which, from its geographical location in the Strand in London, has brought together diasporic people from around the globe to establish international communication networks, and has thus become the focus and locus of some of our research. What we have understood by the term “diasporic space” in this context includes both the materialities of architecture and cyberspace which is the site of digital diasporas (Anderssen) and, indeed, the virtual exchanges featured on “Have Your Say,” the online feedback site (Tuning In). Living the Glocal The BBC WS offers a mode of communication and a series of networks that are spatially located both in the UK, through the material presence of Bush House, and abroad, through the diasporic communities constituting contemporary audiences. The service may have been set up to provide news and entertainment for the British diaspora abroad, but the transformation of the UK into a multi-ethnic society “at home,” alongside its commitment to, and the servicing of, no less than 32 countries abroad, demonstrates a new mission and a new balance of power. Different diasporic communities, such as multi-ethnic Londoners, and local and British Muslims in the north of England, demonstrate the dynamics and ambivalences of what is meant by “diaspora” today. For example, the BBC and the WS play an ambiguous role in the lives of UK Muslim communities with Pakistani connections, where consumers of the international news can feel that the BBC is complicit in the conflation of Muslims with terrorists. Engaging Diaspora Audiences demonstrated the diversity of audience reception in a climate of marginalisation, often bordering on moral panic, and showed how diasporic audiences often use Al-Jazeera or Pakistani and Urdu channels, which are seen to take up more sympathetic political positions. It seems, however, that more egalitarian conversations are becoming possible through the channels of the WS. The participation of local people in the BBC WS global project is seen, for example, as in the popular “Witness Seminars” that have both a current focus and one that is projected into the future, as in the case of the “2012 Generation” (that is, the young people who come of age in 2012, the year of the London Olympics). The Witness Seminars demonstrate the recuperation of past political and social events such as “Bangladesh in 1971” (Tuning In), “The Cold War seminar” (Tuning In) and “Diasporic Nationhood” (the cultural movements reiterated and recovered in the “Literary Lives” project (Gillespie, Baumann and Zinik). Indeed, the WS’s current focus on the “2012 Generation,” including an event in which 27 young people (each of whom speaks one of the WS languages) were invited to an open day at Bush House in 2009, vividly illustrates how things have changed. Whereas in 1948 (the last occasion when the Olympic Games were held in London), the world came to London, it is arguable that, in 2012, in contemporary multi-ethnic Britain, the world is already here (Webb). This enterprise has the advantage of giving voice to the present rather than filtering the present through the legacies of colonialism that remain a problem for the Witness Seminars more generally. The democratising possibilities of sport, as well as the restrictions of its globalising elements, are well represented by Tuning In (Woodward). Sport has, of course become more globalised, especially through the development of Internet and satellite technologies (Giulianotti) but it retains powerful local affiliations and identifications. At all levels and in diverse places, there are strong attachments to local and national teams that are constitutive of communities, including diasporic and multi-ethnic communities. Sport is both typical and distinctive of the BBC World Service; something that is part of a wider picture but also an area of experience with a life of its own. Our “Sport across Diasporas” project has thus explored some of the routes the World Service has travelled in its engagement with sport in order to provide some understanding of the legacy of empire and patriarchy, as well as engaging with the multiplicities of change in the reconstruction of Britishness. Here, it is important to recognise that what began as “BBC Sport” evolved into “World Service Sport.” Coverage of the world’s biggest sporting events was established through the 1930s to the 1960s in the development of the BBC WS. However, it is not only the global dimensions of sporting events that have been assumed; so too are national identifications. There is no question that the superiority of British/English sport is naturalised through its dominance of the BBC WS airways, but the possibilities of reinterpretation and re-accommodation have also been made possible. There has, indeed, been a changing place of sport in the BBC WS, which can only be understood with reference to wider changes in the relationship between broadcasting and sport, and demonstrates the powerful synchronies between social, political, technological, economic, and cultural factors, notably those that make up the media–sport–commerce nexus that drives so much of the trajectory of contemporary sport. Diasporic audiences shape the schedule as much as what is broadcast. There is no single voice of the BBC in sport. The BBC archive demonstrates a variety of narratives through the development and transformation of the World Service’s sports broadcasting. There are, however, silences: notably those involving women. Sport is still a patriarchal field. However, the imperial genealogies of sport are inextricably entwined with the social, political, and cultural changes taking place in the wider world. There is no detectable linear narrative but rather a series of tensions and contradictions that are reflected and reconfigured in the texts in which deliberations are made. In sport broadcasting, the relationship of the BBC WS with its listeners is, in many instances, genuinely dialogic: for example, through “Have Your Say” websites and internet forums, and some of the actors in these dialogic exchanges are the broadcasters themselves. The history of the BBC and the World Service is one which manifests a degree of autonomy and some spontaneity on the part of journalists and broadcasters. For example, in the case of the BBC WS African sports program, Fast Track (2009), many of the broadcasters interviewed report being able to cover material not technically within their brief; news journalists are able to engage with sporting events and sports journalists have covered social and political news (Woodward). Sometimes this is a matter of taking the initiative or simply of being in the right place at the right time, although this affords an agency to journalists which is increasingly unlikely in the twenty-first century. The Politics of Translation: Words and Music The World Service has played a key role as a cultural broker in the political arena through what could be construed as “educational broadcasting” via the wider terrain of the arts: for example, literature, drama, poetry, and music. Over the years, Bush House has been a home-from-home for poets: internationalists, translators from classical and modern languages, and bohemians; a constituency that, for all its cosmopolitanism, was predominantly white and male in the early days. For example, in the 1930s and 1940s, Louis MacNeice was commissioning editor and surrounded by a friendship network of salaried poets, such as W. H. Auden, Dylan Thomas, C. Day Lewis, and Stephen Spender, who wrote and performed their work for the WS. The foreign language departments of the BBC WS, meanwhile, hired émigrés and exiles from their countries’ educated elites to do similar work. The biannual, book-format journal Modern Poetry in Translation (MPT), which was founded in 1965 by Daniel Weissbort and Ted Hughes, included a dedication in Weissbort’s final issue (MPT 22, 2003) to “Poets at Bush House.” This volume amounts to a celebration of the BBC WS and its creative culture, which extended beyond the confines of broadcasting spaces. The reminiscences in “Poets at Bush House” suggest an institutional culture of informal connections and a fluidity of local exchanges that is resonant of the fluidity of the flows and networks of diaspora (Cheesman). Music, too, has distinctive characteristics that mark out this terrain on the broadcast schedule and in the culture of the BBC WS. Music is differentiated from language-centred genres, making it a particularly powerful medium of cross-cultural exchange. Music is portable and yet is marked by a cultural rootedness that may impede translation and interpretation. Music also carries ambiguities as a marker of status across borders, and it combines aesthetic intensity and diffuseness. The Migrating Music project demonstrated BBC WS mediation of music and identity flows (Toynbee). In the production and scheduling notes, issues of migration and diaspora are often addressed directly in the programming of music, while the movement of peoples is a leitmotif in all programs in which music is played and discussed. Music genres are mobile, diasporic, and can be constitutive of Paul Gilroy’s “Black Atlantic” (Gilroy), which foregrounds the itinerary of West African music to the Caribbean via the Middle Passage, cross-fertilising with European traditions in the Americas to produce blues and other hybrid forms, and the journey of these forms to Europe. The Migrating Music project focused upon the role of the BBC WS as narrator of the Black Atlantic story and of South Asian cross-over music, from bhangra to filmi, which can be situated among the South Asian diaspora in east and south Africa as well as the Caribbean where they now interact with reggae, calypso, Rapso, and Popso. The transversal flows of music and lyrics encompasses the lived experience of the different diasporas that are accommodated in the BBC WS schedules: for example, they keep alive the connection between the Irish “at home” and in the diaspora through programs featuring traditional music, further demonstrating the interconnections between local and global attachments as well as points of disconnection and contradiction. Textual analysis—including discourse analysis of presenters’ speech, program trailers and dialogue and the BBC’s own construction of “world music”—has revealed that the BBC WS itself performs a constitutive role in keeping alive these traditions. Music, too, has a range of emotional affects which are manifest in the semiotic analyses that have been conducted of recordings and performances. Further, the creative personnel who are involved in music programming, including musicians, play their own role in this ongoing process of musical migration. Once again, the networks of people involved as practitioners become central to the processes and systems through which diasporic audiences are re-produced and engaged. Conclusion The BBC WS can claim to be a global and local cultural intermediary not only because the service was set up to engage with the British diaspora in an international context but because the service, today, is demonstrably a voice that is continually negotiating multi-ethnic audiences both in the UK and across the world. At best, the World Service is a dynamic facilitator of conversations within and across diasporas: ideas are relocated, translated, and travel in different directions. The “local” of a British broadcasting service, established to promote British values across the globe, has been transformed, both through its engagements with an increasingly diverse set of diasporic audiences and through the transformations in how diasporas themselves self-define and operate. On the BBC WS, demographic, social, and cultural changes mean that the global is now to be found in the local of the UK and any simplistic separation of local and global is no longer tenable. The educative role once adopted by the BBC, and then the World Service, nevertheless still persists in other contexts (“from Ambridge to Afghanistan”), and clearly the WS still treads a dangerous path between the paternalism and patriarchy of its colonial past and its responsiveness to change. In spite of competition from television, satellite, and Internet technologies which challenge the BBC’s former hegemony, the BBC World Service continues to be a dynamic space for (re)creating and (re)instating diasporic audiences: audiences, texts, and broadcasters intersect with social, economic, political, and cultural forces. The monologic “voice of empire” has been countered and translated into the language of diversity and while, at times, the relationship between continuity and change may be seen to exist in awkward tension, it is clear that the Corporation is adapting to the needs of its twenty-first century audience. ReferencesAnderson, Benedict. Imagined Communities, Reflections of the Origin and Spread of Nationalism. London: Verso, 1983. Anderssen, Matilda. “Digital Diasporas.” 2010. 30 Nov. 2010 ‹http://www8.open.ac.uk/researchprojects/diasporas/cross-research/digital-diasporas›. Bhabha, Homi. The Location of Culture. London: Routledge, 1994. Briggs, Asa. A History of Broadcasting in the United Kingdom, Volume II: The Golden Age of Wireless. Oxford: Oxford UP, 1995. Cheesman, Tom. “Poetries On and Off Air.” 2010. 30 Nov. 2010 ‹http://www8.open.ac.uk/researchprojects/diasporas/cross-research/bush-house-cultures›. Chivallon, Christine. “Beyond Gilroy’s Black Atlantic: The Experience of the African Diaspora.” Diaspora 11.3 (2002): 359–82. Clifford, James. Routes: Travel and Translation in the Late Twentieth Century. Cambridge: Cambridge UP, 1997. Fast Track. BBC, 2009. 30 Nov. 2010 ‹http://www.bbc.co.uk/worldservice/sport/2009/03/000000_fast_track.shtml›. Gillespie, Marie, Alban Webb, and Gerd Baumann (eds.). “The BBC World Service 1932–2007: Broadcasting Britishness Abroad.” Special Issue. The Historical Journal of Film, Radio and Television 28.4 (Oct. 2008). Gillespie, Marie, Gerd Baumann, and Zinovy Zinik. “Poets at Bush House.” 2010. 30 Nov. 2010 ‹http://www8.open.ac.uk/researchprojects/diasporas/about›. Gilroy, Paul. Black Atlantic. MA: Harvard UP, 1993. Giulianotti, Richard. Sport: A Critical Sociology. Cambridge: Polity, 2005. Goldblatt, David. “The Cricket Revolution.” 2009. 30 Nov. 2010 ‹http://www.bbc.co.uk/programmes/p0036ww9›. Guha, Ramachandra. A Corner of a Foreign Field: The Indian History of an English Game. London: Picador, 2002. Hall, Stuart. “Cultural Identity and Diaspora.” Identity: Community, Culture, Difference. Ed. Jonathan Rutherford. London: Lawrence and Wishart, 1990, 223–37. Hill, Andrew. “The BBC Empire Service: The Voice, the Discourse of the Master and Ventriloquism.” South Asian Diaspora 2.1 (2010): 25–38. Hollis, Robert, Norma Rinsler, and Daniel Weissbort. “Poets at Bush House: The BBC World Service.” Modern Poetry in Translation 22 (2003). Nandy, Ashis. The Tao of Cricket: On Games of Destiny and the Destiny of Games. New Delhi: Oxford UP, 1989. Pratt, Mary Louise. Imperial Eyes: Travel Writing and Transculturation. London: Routledge, 1992. 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IntroductionThe walking tour is an enduring feature of cities. Fuelled by a desire to learn more about the hidden and unknown spaces of the city, the walking tour has moved beyond its historical role as tourist attraction to play a key role in the transformation of urban space through gentrification. Conversely, the walking tour has a counter-history as part of a critical urban praxis. This article reflects on historical examples, as well as our own experience of conducting Field Trip, a critical geographical walking tour through an industrial precinct in Marrickville, a suburb of Sydney that is set to undergo rapid change as a result of high-rise residential apartment construction (Gibson et al.). This precinct, known as Carrington Road, is located on the unceded land of the Cadigal and Wangal people of the Eora nation who call the area Bulanaming.Drawing on a long history of philosophical walking, many contemporary writers (Solnit; Gros; Bendiner-Viani) have described walking as a practice that can open different ways of thinking, observing and being in the world. Some have focused on the value of walking to the study of place (Hall; Philips; Heddon), and have underscored its relationship to established research methods, such as sensory ethnography (Springgay and Truman). The work of Michel de Certeau pays particular attention to the relationship between walking and the city. In particular, the concepts of tactics and strategy have been applied in a variety of ways across cultural studies, cultural geography, and urban studies (Morris). In line with de Certeau’s thinking, we view walking as an example of a tactic – a routine and often unconscious practice that can become a form of creative resistance.In this sense, walking can be a way to engage in and design the city by opposing its structures, or strategies. For example, walking in a city such as Sydney that is designed for cars requires choosing alternative paths, redirecting flows of people and traffic, and creating custom shortcuts. Choosing pedestrianism in Sydney can certainly feel like a form of resistance, and we make the argument that Field Trip – and walking tours more generally – can be a way of doing this collectively, firstly by moving in opposite directions, and secondly, at incongruent speeds to those for whom the scale and style of strategic urban development is inevitable. How such tactical walking relates to the design of cities, however, is less clear. Walking is a generally described in the literature as an individual act, while the design of cities is, at its best participatory, and always involving multiple stakeholders. This reveals a tension between the practice of walking as a détournement or appropriation of urban space, and its relationship to existing built form. Field Trip, as an example of collective walking, is one such appropriation of urban space – one designed to lead to more democratic decision making around the planning and design of cities. Given the anti-democratic, “post-political” nature of contemporary “consultation” processes, this is a seemingly huge task (Legacy et al.; Ruming). We make the argument that Field Trip – and walking tours more generally – can be a form of collective resistance to top-down urban planning.By using an open-source wiki in combination with the Internet Archive, Field Trip also seeks to collectively document and make public the local knowledge generated by walking at the frontier of gentrification. We discuss these digital choices as oppositional practice, and consider the idea of tactical media (Lovink and Garcia; Raley) in order to connect knowledge sharing with the practice of walking.This article is structured in four parts. Firstly, we provide a historical introduction to the relationship between walking tours and gentrification of global cities. Secondly, we examine the significance of walking tours in Sydney and then specifically within Marrickville. Thirdly, we discuss the Field Trip project as a citizen-led walking tour and, finally, elaborate on its role as tactical media project and offer some conclusions.The Walking Tour and Gentrification From the outset, people have been walking the city in their own ways and creating their own systems of navigation, often in spite of the plans of officialdom. The rapid expansion of cities following the Industrial Revolution led to the emergence of “imaginative geographies”, where mediated representations of different urban conditions became a stand-in for lived experience (Steinbrink 219). The urban walking tour as mediated political tactic was utilised as far back as Victorian England, for reasons including the celebration of public works like the sewer system (Garrett), and the “othering” of the working class through upper- and middle-class “slum tourism” in London’s East End (Steinbrink 220). The influence of the Situationist theory of dérive has been immense upon those interested in walking the city, and we borrow from the dérive a desire to report on the under-reported spaces of the city, and to articulate alternative voices within the city in this project. It should be noted, however, that as Field Trip was developed for general public participation, and was organised with institutional support, some aspects of the dérive – particularly its disregard for formal structure – were unable to be incorporated into the project. Our responsibility to the participants of Field Trip, moreover, required the imposition of structure and timetable upon the walk. However, our individual and collective preparation for Field Trip, as well as our collective understanding of the area to be examined, has been heavily informed by psychogeographic methods that focus on quotidian and informal urban practices (Crosby and Searle; Iveson et al).In post-war American cities, walking tours were utilised in the service of gentrification. Many tours were organised by real estate agents with the express purpose of selling devalorised inner-city real estate to urban “pioneers” for renovation, including in Boston’s South End (Tissot) and Brooklyn’s Park Slope, among others (Lees et al 25). These tours focused on a symbolic revalorisation of “slum neighbourhoods” through a focus on “high culture”, with architectural and design heritage featuring prominently. At the same time, urban socio-economic and cultural issues – poverty, homelessness, income disparity, displacement – were downplayed or overlooked. These tours contributed to a climate in which property speculation and displacement through gentrification practices were normalised. To this day, “ghetto tours” operate in minority neighbourhoods in Brooklyn, serving as a beachhead for gentrification.Elsewhere in the world, walking tours are often voyeuristic, featuring “locals” guiding well-meaning tourists through the neighbourhoods of some of the world’s most impoverished communities. Examples include the long runningKlong Toei Private Tour, through “Bangkok’s oldest and largest slum”, or the now-ceased Jakarta Hidden Tours, which took tourists to the riverbanks of Jakarta to see the city’s poorest before they were displaced by gentrification.More recently, all over the world activists have engaged in walking tours to provide their own perspective on urban change, attempting to direct the gentrifier’s gaze inward. Whilst the most confrontational of these might be the Yuppie Gazing Tour of Vancouver’s historically marginalised Downtown Eastside, other tours have highlighted the deleterious effects of gentrification in Williamsburg, San Francisco, Oakland, and Surabaya, among others. In smaller towns, walking tours have been utilised to highlight the erasure of marginalised scenes and subcultures, including underground creative spaces, migrant enclaves, alternative and queer spaces. Walking Sydney, Walking Marrickville In many cities, there are now both walking tours that intend to scaffold urban renewal, and those that resist gentrification with alternative narratives. There are also some that unwittingly do both simultaneously. Marrickville is a historically working-class and migrant suburb with sizeable populations of Greek and Vietnamese migrants (Graham and Connell), as well as a strong history of manufacturing (Castles et al.), which has been undergoing gentrification for some time, with the arts playing an often contradictory role in its transformation (Gibson and Homan). More recently, as the suburb experiences rampant, financialised property development driven by global flows of capital, property developers have organised their own self-guided walking tours, deployed to facilitate the familiarisation of potential purchasers of dwellings with local amenities and ‘character’ in precincts where redevelopment is set to occur. Mirvac, Marrickville’s most active developer, has designed its own self-guided walking tour Hit the Marrickville Pavement to “explore what’s on offer” and “chat to locals”: just 7km from the CBD, Marrickville is fast becoming one of Sydney’s most iconic suburbs – a melting pot of cuisines, creative arts and characters founded on a rich multicultural heritage.The perfect introduction, this self-guided walking tour explores Marrickville’s historical architecture at a leisurely pace, finishing up at the pub.So, strap on your walking shoes; you're in for a treat.Other walking tours in the area seek to highlight political, ecological, and architectural dimension of Marrickville. For example, Marrickville Maps: Tropical Imaginaries of Abundance provides a series of plant-led walks in the suburb; The Warren Walk is a tour organised by local Australian Labor Party MP Anthony Albanese highlighting “the influence of early settlers such as the Schwebel family on the area’s history” whilst presenting a “political snapshot” of ALP history in the area. The Australian Ugliness, in contrast, was a walking tour organised by Thomas Lee in 2016 that offered an insight into the relationships between the visual amenity of the streetscape, aesthetic judgments of an ambiguous nature, and the discursive and archival potentialities afforded by camera-equipped smartphones and photo-sharing services like Instagram. Figure 1: Thomas Lee points out canals under the street of Marrickville during The Australian Ugliness, 2016.Sydney is a city adept at erasing its past through poorly designed mega-projects like freeways and office towers, and memorialisation of lost landscapes has tended towards the literary (Berry; Mudie). Resistance to redevelopment, however, has often taken the form of spectacular public intervention, in which public knowledge sharing was a key goal. The Green Bans of the 1970s were partially spurred by redevelopment plans for places like the Rocks and Woolloomooloo (Cook; Iveson), while the remaking of Sydney around the 2000 Olympics led to anti-gentrification actions such as SquatSpace and the Tour of Beauty, an “aesthetic activist” tour of sites in the suburbs of Redfern and Waterloo threatened with “revitalisation.” Figure 2: "Tour of Beauty", Redfern-Waterloo 2016. What marks the Tour of Beauty as significant in this context is the participatory nature of knowledge production: participants in the tours were addressed by representatives of the local community – the Aboriginal Housing Company, the local Indigenous Women’s Centre, REDWatch activist group, architects, designers and more. Each speaker presented their perspective on the rapidly gentrifying suburb, demonstrating how urban space is made an remade through processes of contestation. This differentiation is particularly relevant when considering the basis for Sydney-centric walking tours. Mirvac’s self-guided tour focuses on the easy-to-see historical “high culture” of Marrickville, and encourages participants to “chat to locals” at the pub. It is a highly filtered approach that does not consider broader relations of class, race and gender that constitute Marrickville. A more intense exploration of the social fabric of the city – providing a glimpse of the hidden or unknown spaces – uncovers the layers of social, cultural, and economic history that produce urban space, and fosters a deeper engagement with questions of urban socio-spatial justice.Solnit argues that walking can allow us to encounter “new thoughts and possibilities.” To walk, she writes, is to take a “subversive detour… the scenic route through a half-abandoned landscape of ideas and experiences” (13). In this way, tactical activist walking tours aim to make visible what cannot be seen, in a way that considers the polysemic nature of place, and in doing so, they make visible the hidden relations of power that produce the contemporary city. In contrast, developer-led walking tours are singularly focussed, seeking to attract inflows of capital to neighbourhoods undergoing “renewal.” These tours encourage participants to adopt the position of urban voyeur, whilst activist-led walking tours encourage collaboration and participation in urban struggles to protect and preserve the contested spaces of the city. It is in this context that we sought to devise our own walking tour – Field Trip – to encourage active participation in issues of urban renewal.In organising this walking tour, however, we acknowledge our own entanglements within processes of gentrification. As designers, musicians, writers, academics, researchers, venue managers, artists, and activists, in organising Field Trip, we could easily be identified as “creatives”, implicated in Marrickville’s ongoing transformation. All of us have ongoing and deep-rooted connections to various Sydney subcultures – the same subcultures so routinely splashed across developer advertising material. This project was borne out of Frontyard – a community not-just-art space, and has been supported by the local Inner West Council. As such, Field Trip cannot be divorced from the highly contentious processes of redevelopment and gentrification that are always simmering in the background of discussions about Marrickville. We hope, however, that in this project we have started to highlight alternative voices in those redevelopment processes – and that this may contribute towards a “method of equality” for an ongoing democratisation of those processes (Davidson and Iveson).Field Trip: Urban Geographical Enquiry as Activism Given this context, Field Trip was designed as a public knowledge project that would connect local residents, workers, researchers, and decision-makers to share their experiences living and working in various parts of Sydney that are undergoing rapid change. The site of our project – Carrington Road, Marrickville in Sydney’s inner-west – has been earmarked for major redevelopment in coming years and is quickly becoming a flashpoint for the debates that permeate throughout the whole of Sydney: housing affordability, employment accessibility, gentrification and displacement. To date, public engagement and consultation regarding proposed development at Carrington Road has been limited. A major landholder in the area has engaged a consultancy firm to establish a community reference group (CRG) the help guide the project. The CRG arose after public outcry at an original $1.3 billion proposal to build 2,616 units in twenty towers of up to 105m in height (up to thirty-five storeys) in a predominantly low-rise residential suburb. Save Marrickville, a community group created in response to the proposal, has representatives on this reference group, and has endeavoured to make this process public. Ruming (181) has described these forms of consultation as “post-political,” stating thatin a universe of consensual decision-making among diverse interests, spaces for democratic contest and antagonistic politics are downplayed and technocratic policy development is deployed to support market and development outcomes.Given the notable deficit of spaces for democratic contest, Field Trip was devised as a way to reframe the debate outside of State- and developer-led consultation regimes that guide participants towards accepting the supposed inevitability of redevelopment. We invited a number of people affected by the proposed plans to speak during the walking tour at a location of their choosing, to discuss the work they do, the effect that redevelopment would have on their work, and their hopes and plans for the future. The walking tour was advertised publicly and the talks were recorded, edited and released as freely available podcasts. The proposed redevelopment of Carrington Road provided us with a unique opportunity to develop and operate our own walking tour. The linear street created an obvious “circuit” to the tour – up one side of the road, and down the other. We selected speakers based on pre-existing relationships, some formed during prior rounds of research (Gibson et al.). Speakers included a local Aboriginal elder, a representative from the Marrickville Historical Society, two workers (who also gave tours of their workplaces), the Lead Heritage Adviser at Sydney Water, who gave us a tour of the Carrington Road pumping station, and a representative from the Save Marrickville residents’ group. Whilst this provided a number of perspectives on the day, regrettably some groups were unrepresented, most notably the perspective of migrant groups who have a long-standing association with industrial precincts in Marrickville. It is hoped that further community input and collaboration in future iterations of Field Trip will address these issues of representation in community-led walking tours.A number of new understandings became apparent during the walking tour. For instance, the heritage-listed Carrington Road sewage pumping station, which is of “historic and aesthetic significance”, is unable to cope with the proposed level of residential development. According to Philip Bennett, Lead Heritage Adviser at Sydney Water, the best way to maintain this piece of heritage infrastructure is to keep it running. While this issue had been discussed in private meetings between Sydney Water and the developer, there is no formal mechanism to make this expert knowledge public or accessible. Similarly, through the Acknowledgement of Country for Field Trip, undertaken by Donna Ingram, Cultural Representative and a member of the Metropolitan Local Aboriginal Land Council, it became clear that the local Indigenous community had not been consulted in the development proposals for Carrington Road. This information, while not necessary secret, had also not been made public. Finally, the inclusion of knowledgeable local workers whose businesses are located on Carrington Road provided an insight into the “everyday.” They talked of community and collaboration, of site-specificity, the importance of clustering within their niche industries, and their fears for of displacement should redevelopment proceed.Via a community-led, participatory walking tour like Field Trip, threads of knowledge and new information are uncovered. These help create new spatial stories and readings of the landscape, broadening the scope of possibility for democratic participation in cities. Figure 3: Donna Ingram at Field Trip 2018.Tactical Walking, Tactical Media Stories connected to walking provide an opportunity for people to read the landscape differently (Mitchell). One of the goals of Field Trip was to begin a public knowledge exchange about Carrington Road so that spatial stories could be shared, and new readings of urban development could spread beyond the confines of the self-contained tour. Once shared, this knowledge becomes a story, and once remixed into existing stories and integrated into the way we understand the neighbourhood, a collective spatial practice is generated. “Every story is a travel story – a spatial practice”, says de Certeau in “Spatial Stories”. “In reality, they organise walks” (72). As well as taking a tactical approach to walking, we took a tactical approach to the mediation of the knowledge, by recording and broadcasting the voices on the walk and feeding information to a publicly accessible wiki. The term “tactical media” is an extension of de Certeau’s concept of tactics. David Garcia and Geert Lovink applied de Certeau’s concept of tactics to the field of media activism in their manifesto of tactical media, identifying a class of producers who amplify temporary reversals in the flow of power by exploiting the spaces, channels and platforms necessary for their practices. Tactical media has been used since the late nineties to help explain a range of open-source practices that appropriate technological tools for political purposes. While pointing out the many material distinctions between different types of tactical media projects within the arts, Rita Raley describes them as “forms of critical intervention, dissent and resistance” (6). The term has also been adopted by media activists engaged in a range of practices all over the world, including the Tactical Technology Collective. For Field Trip, tactical media is a way of creating representations that help navigate neighbourhoods as well as alternative political processes that shape them. In this sense, tactical representations do not “offer the omniscient point of view we associate with Cartesian cartographic practice” (Raley 2). Rather these representations are politically subjective systems of navigation that make visible hidden information and connect people to the decisions affecting their lives. Conclusion We have shown that the walking tour can be a tourist attraction, a catalyst to the transformation of urban space through gentrification, and an activist intervention into processes of urban renewal that exclude people and alternative ways of being in the city. This article presents practice-led research through the design of Field Trip. By walking collectively, we have focused on tactical ways of opening up participation in the future of neighbourhoods, and more broadly in designing the city. 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