城市道路U形转向路口结合公交车站对交通流影响的模拟分析  

Influence of U-turn Movement Combined of Bus Stop on the Dynamics of Traffic Flow

作　　者：冯雪[1] 王喜富[1] 

机构地区：[1]北京交通大学交通运输学院,北京100044

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第5期990-995,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金资助项目(批准号:61272029;7301007)

摘　　要：采用元胞自动机模型对U形转向路口结合公交站的组合瓶颈下的交通流特性进行模拟分析.并分别研究了公交站点位于U形转向路口的上游及下游2种设置方式对交通流特性的影响.模拟结果表明,U形转向路口与公交站点间的距离低于最小间距LDc时将造成双向交通流量及转向流量的下降.当LD足够大,转向车流与公交流方向相同且对向流量较小时,以及转向车流与公交车流方向相反时,下游设置方式的双向交通流量与转向流量明显高于上游设置方式.在实际交通规划与管理时应结合转向需求、公交车比例等多种因素合理安排两站点的相对位置,以减少上述组合瓶颈的负面影响.The aim of this work is to investigate the combined effect of the U‐turn intersection and its nearby bus stop ,by using a CA model .Four cases that the bus stop locates upstream or dow nstream the U‐turn intersection ,and ones with the same moving direction or not are considered .The simula‐tion results show that the combined bottleneck has significant influence on traffic flow .If the distance between the bus stop and the U‐turn intersection is lower than a critical point LDc ,the phenomenon of flux drop will appear ;otherwise ,comparisons among four cases suggest that ,in both scene of same moving direction with low opposite flow and scene of opposite moving direction ,the downstream stop performs better than the upstream one .Thus ,in real traffic ,according to simulation results based on elements of U‐turn demand ,ratio of bus and so on ,negative effect of the combined bottleneck will be minimized by adjusting the position of the bus stop .

关 键 词：U形转向 公交车站 元胞自动机 混合交通 

分 类 号：U491[交通运输工程—交通运输规划与管理]