A model of bus bunching under reliability-based passenger arrival patterns

If bus service departure times are not completely unknown to the passengers, non-uniform passenger arrival patterns can be expected. We propose that passengers decide their arrival time at stops based on a continuous logit model that considers the risk of missing services. Expected passenger waiting times are derived in a bus system that allows also for overtaking between bus services. We then propose an algorithm to derive the dwell time of subsequent buses serving a stop in order to illustrate when bus bunching might occur. We show that non-uniform arrival patterns can significantly influence the bus bunching process. With case studies we find that, even without exogenous delay, bunching can arise when the boarding rate is insufficient given the level of overall demand. Further, in case of exogenous delay, non-uniform arrivals can either worsen or improve the bunching conditions, depending on the level of delay. We conclude that therefore such effects should be considered when service control measures are discussed.     

Reducing bunching with bus-to-bus cooperation

Schedule-based or headway-based control schemes to reduce bus bunching are not resilient because they cannot prevent buses from losing ground to the buses they follow when disruptions increase the gaps separating them beyond a critical value. (Following buses are then overwhelmed with passengers and cannot process their work quick enough to catch up.) This critical gap problem can be avoided, however, if buses at the leading end of such gaps are given information to cooperate with the ones behind by slowing down.This paper builds on this idea. It proposes an adaptive control scheme that adjusts a bus cruising speed in real-time based on both, its front and rear spacings much as if successive bus pairs were connected by springs. The scheme is shown to yield regular headways with faster bus travel than existing control methods. Its simple and decentralized logic automatically compensates for traffic disruptions and inaccurate bus driver actions. Its hardware and data requirements are minimal.     

BRT系统高峰期运营管理策略浅析

针对目前BRT系统在高峰期运营的不足,提出了BRT系统在高峰期的运营管理设计及具体策略,通过结合ITS技术实现对人、车、站、道等有效管理,为交通管理部门决策提供参考.     

清洁发展机制在快速公交系统中的可行性分析

介绍清洁发展机制(CDM)的内涵,CDM项目的总要求及项目审批程序和过程。基于哥伦比亚波哥大快速公交系统(Trans Milenio)项目,根据清洁发展机制(CDM)的运行经验,分析我国快速公交系统(BRT)申请清洁发展机制的可行性及发展趋势,最后,对开展的相关工作提出建议。     

基于最大利润的中小城市公交线路长度模型研究

公交线路长度指标在规范中没有具体的规定,而一般经验值并不适用于国内大多数中小城市,本文通过基于公交效益比的分析计算出适合中小城市的公交线路长度,使公交运营在保证快速地均衡地输送乘客的情况下获得最大利润,并为中小城市公交规划提供一定的依据.     

厦门BRT链接线服务范围延伸作用研究

BRT作为一种可持续的城市公共交通模式,它所具有的快速性、灵活性和成本效应对国内城市尤为适合.基于BRT的优点及厦门市交通现状,厦门市BRT一期工程及其链接线于2008年9月初建成并投入运营.本文主要针对厦门市“BRT+链接线”模式,通过服务半径及覆盖面积的计算,分析BRT链接线对BRT主线服务范围的延伸作用及设置BRT链接线的相关意义.     

基于北斗的节能型智能公交电子站牌的开发及应用

解决“市民出行难”问题一直是政府部门关注的民生问题,实现公交信息化是解决“出行难”问题的重要环节和出路.本文提出了一种基于北斗导航系统的节能型智能公交电子站牌系统结构设计方案,有利于市民选择公交作为出行方式.同时,能提升公交公司的服务水平和质量。     

城市公共交通中的公交输送能力问题探讨

本文通过对城市交通现状的分析,指出发展城市公共交通的必要性,针对公交运行中的问题,引出了公交输送能力这一考查指标,并建立了公交输送能力模型。最后以中关村大街人民大学站为例进行了定量分析,提出如何用公交输送能力来明确公共交通中出现的问题,对研究公交线路和车辆的优化配置提供了理论依据。     

城市尽端区域对外交通疏解通道研究 ——以青岛维多利亚湾小区为例

随着城市道路交通拥堵越来越严重,人们的对外出行受到了挑战,需要采取综合治理措施.本文以青岛维多利亚湾小区为例,详细分析了现状交通问题,提出了详细的规划策略,包括提高公交出行水平,降低小汽车交通出行量;提高交通出行安全性,实现客货分离;扩容对外疏解通道,满足近远期交通需求;加强交通管理,设置潮汐车道等规划策略.并对交通策...