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- 저자 : S.C.Wirasinghe (검색결과 4 건)
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S.C.Wirasinghe,L. Kattan,M.M. Rahman,J. Hubbell,R. Thilakaratne,S. Anowar 서울시립대학교 도시과학연구원 2013 도시과학국제저널 Vol.17 No.1
Bus Rapid Transit (BRT) has been demonstrated to provide efficient and effective public transport that can even increase transit ridership and attractiveness within defined urban corridors in both developing and developed countries. The merit of the BRT system lies in its ability to provide a high quality public transit service with limited infrastructure and at a relatively low capital and operating cost. In this paper an attempt is made to review BRT characteristics in some detail. An overview of the elements of BRT systems: the running ways, vehicles, stations, as well as operational control, fare collection and passenger information systems is presented. This paper also discusses how these elements allows BRT services to achieve the speed, capacity, reliability, accessibility and operational safety characteristics that distinguishes such systems from regular express bus services. Each built BRT system is unique and depends on how these basic elements are designed and integrated. Environmental, social and economic impacts, users’ perception and modal shift towards BRT have also been critically reviewed. With the presence of local land use and transport policies that support high-density and mixed developments, BRT has been found to attract potential developments around stations and along its corridor, increasing land values and promoting sustainable development. As reported in the literature, the infrastructure costs vary greatly depending on the costs of land acquisition, station design, degree of separation from traffic, technological features and material, labor costs. Thus, BRT capital costs cannot be generalised and must be transferred carefully based on the changes of the input costs that vary from one place to another. The barriers to BRT that block the achievement of significant success in customer satisfaction and ridership gains are mentioned with specific case studies. The review of BRT indicates that in some cases it has similar performance to higher order public transit; however, it still has its unique characteristics that set it apart.
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Implementation of Bus Rapid Transit (BRT) on an optimal segment of a long regular bus route
R. S. Thilakaratne,S.C.Wirasinghe 서울시립대학교 도시과학연구원 2016 도시과학국제저널 Vol.20 No.1
Major public transit routes evolve overtime due to changes in demand caused by variations, for example, in land use, household income. As well there are demand/supply interactions due to implementation of new transit technologies such as Light Rail Transit or Bus Rapid Transit (BRT) and/or changes in mode of service, for example, skip-stop operations. Planning for such transitions must be done carefully and well in advance to enable on-time implementation. In this paper, we consider the transition from a long, regular bus route in a corridor to a route with a limited stop BRT along a segment of the corridor and a modified regular bus service along its full length. This problem is often faced by transit agencies when they try to make decisions regarding the design parameters of a BRT service. This transition can increase the average speed and maximum possible passenger flow on the route. The proposed approach optimizes the headways of the regular and BRT routes, and chooses the termini of the BRT segment as well as the limited BRT stops. Priority for BRT service is given to O–D pairs with a high value of passengerhours, essentially the ‘product of the travel demand and the travel time’. Total optimal system costs before and after the mode transition is considered through analytical modelling, and a simple equation is derived for the difference. If the new optimal total system cost, including costs associated with passenger in-vehicle travel time, waiting time, vehicle operating costs, and system capital costs, is lower, the transition is favoured. Insights into the proposed transition are provided through the analytical modelling approach.
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Bus headway optimization with consumer surplus as a measure of societal benefit
Jason Hawkins,S. C. Wirasinghe,J. D. Hunt 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.1
This paper derives the square root bus dispatch optimization developed by Newell from consumer surplus rather than the original cost minimization function. We then extend the model to consider dispatch-variant demand and outline its property relative to the original model by Newell. Demand elasticity is introduced via a multinomial logit mode choice model. Results are tested for City of Edmonton mode choice and ridership. The sensitivity of the function to wait time cost and passenger demand is tested. For the observed passenger demand and value of travel time, our analysis suggests there is a portion of riders who are captive and will suffer increasing wait time costs, but many passengers will make the choice to utilize other modes of travel when faced with increasing bus headways.
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Public Transportation and Sustainability: A Review
Patrick Miller,Alexandre G. de Barros,Lina Kattan,S.C.Wirasinghe 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.3
Public transportation is often framed as a key component of building sustainable cities. Conversely, the social, economic, and environmental impacts of transport are framed as critical issues that can challenge the sustainability of cities and regions. This paper presents a critical literature review of the relationship between public transportation and sustainability. First the paper offers a review of key sustainable transportation concepts and how public transport contributes to sustainability goals. Second, the paper reviews past studies that analyse sustainable transportation in order to develop recommendations for planning, engineering, and researching sustainable public transport. Finally, the paper concludes by offering suggestions for future research into the sustainability performance of public transit.
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