拥挤交通状态下的绿信比优化及其应用研究.doc

拥挤交通状态下的绿信比优化及其应用研究* 裴玉龙,蒋贤才,刘博航(哈尔滨工业大学交通研究所,哈尔滨 150090 ) 摘要:在拥挤交通状态下, W ebster 绿信比优化模型是要同时消散各个方向上的拥挤车流,却忽略了拥挤与非拥挤交通状态下的车流特征差异,导致信号交叉口各个方向上的排队车辆越来越长。提出采用通行优先权的方式,对交通需求大的方向给予更多的绿灯时间,以期实现尽快消散该方向上的拥挤车流。各个方向(相位)通过轮流获得相位通行优先权进而逐步消散各自方向上的拥挤车流,最终达到预防交通拥挤和快速消散交通拥挤的优化目标。经仿真实验证实,本优化方法在处理拥挤交通流上较之 W ebster 绿信比优化模型更为有效。关键字: 优化;绿信比;拥挤交通中图分类号: U4 +4文献标识码: A文章编号; Study of Green Ratio Optimization in Oversaturated Traffic PEI Yu-long, JIANG Xian-cai, LIU Bo-hang ( Institute of Transportation Research , Harbin Institute of Technology, 150090 China) Abstract: The green ratio model of Webster clears off crowded traffic flow synchronously at each approach of signal intersection in over saturated traffic, but ignores the difference of traffic flow s in different traffic state, and leads to the queue ing longer and longer at over saturated signal intersection. The paper introduces an idea of traffic priority. It deals out more green time for the phase which has the high est traffic demand in over saturated traffic , so as to prevent and clear off the crowded traffic flow as soon as possible .E ach phase gets the priority by turn s, so the improved green ratio model can realize the goal of preventing traffic congestion and clearing off traffic blockage quickly. It is more effective than the Webster ’s one in dealing with over saturated traffic flow by simulating experiment based on VISSIM . And