车路协同下信号控制交叉口两难区问题改善方法

Methods for Alleviating Dilemma Zone Problem of Signal Control Intersection Based on Cooperated Vehicle Infrastructure System

为降低两难区对信号控制交叉口交通安全的影响,针对车路协同环境下交通信息获取方式及交叉口区域车辆运行特点,提出信号控制交叉口两难区问题改善方法。在分析各种两难区问题改善措施的适用性基础上,确定车路协同环境下信号控制交叉口两难区问题改善方法的工作流程,综合运用车速引导、动态绿灯时间延长和黄灯时间调整等3种措施降低车辆进入两难区的概率,并提出主要参数计算方法。运用Vissim软件进行仿真试验,结果表明,笔者建立的两难区问题改善方法能使车辆闯红灯次数平均降低78.1%,且改善效果在低峰流量时优于高峰流量时。

In order to reduce adverse influence of dilemma zone on signal intersection＇s safety, improve- ment methods for dilemma zone of signal intersection were presented, which considering traffic information collection method and vehicle＇s running characteristics under Cooperated Vehicle Infrastructure System. Applicability of existing measures was analyzed, and working process of the improvement methods for dilemma zone based on Cooperated Vehicle Infrastructure System was described, which comprehensively using speed guide, dynamic green light extend and yellow light adjustment, to minimize probability of vehicles falling in dilemma zone. Mathematical models of some main parameters were also discussed. Sim- ulation experiments were accomplished by VISSIM, and the results show that the improvement methods can decrease number of vehicles rushing through the red light, the average ratio is 78.1% , and the effect under low traffic flow is better than that under high traffic flow.