城市道路U形转向交通流特性模拟分析  

The influence of U-turn movement on the dynamics of traffic flow

作　　者：郭宏伟[1] 高自友[1] 谢东繁[1] 

机构地区：[1]北京交通大学交通运输学院系统科学所

出　　处：《物理学报》2011年第5期808-817,共10页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB705500);国家自然科学基金(批准号:70631001;70701004)资助的课题~~

摘　　要：以NaSch模型为基础建立设置U形转向的路段交通流模型,对其特性进行模拟分析.结果表明,U形转向路口对交通流影响显著,会导致在较小进车概率时发生自由流状态到拥挤状态的相变,相应的临界流量也随之降低.设置双U形转向系统的相变、临界流量等交通流特性与单转向系统具有明显差异,其系统效率较高.在实际交通规划与管理时应避免设置单转向系统,以减小U形转向的负面影响.U-turn movement is a common form of traffic organization in urban streets.A traffic flow model for U-turn movement based on the NaSch cellular automaton model is proposed to simulate and analyze the dynamics of U-turn movement.The results indicated that the U-turn movement has significant effect on the traffic flow,and it is a typical bottleneck.The U-turn movement can cause phase transition at small probability of vehicle generation and the critical flow also decreases obviously.The system with two U-turn movement is different from the system with one U-turn movement in traffic features such as phase transition and critical flux.The one U-turn system has a good performance.It is suggested that the system with a couple of U-turns may help mitigate the negative effect of U-turn movement in traffic planning and management.

关 键 词：交通流 元胞自动机 U形转向 相变 

分 类 号：U491.112[交通运输工程—交通运输规划与管理]