摘要
为了提高不同通行模式下平面信号控制交叉口的安全性,提出一种基于混合交通流的交叉口绿灯间隔计算方法。利用在车流超负荷状态时更贴合实际的交通流实用模型,将绿灯间隔影响因素之一的车辆速度转换为交通量进行计算,避免了车辆速度标定的困难,并基于实测数据验证该车速替换方法的合理性。分析采取不同非机动车通行模式的交叉口的冲突点分布,得到基于最高效率极限的改进绿灯间隔计算方法。为验证该方法对交叉口安全性的改善,选取2种代表性绿灯间隔设计方法作为对比。对宿迁市采用传统渠化方式的项王路-黄河路交叉口进行绿灯间隔设计,在3种绿灯间隔设计方法的基础上完成信号灯配时并进行仿真。结果表明,改进后的绿灯间隔计算方法能在保证交叉口通行效率的前提下减小其冲突发生的可能性,对交叉口安全性的提升效果优于现有绿灯间隔设计方法。该方法能基于不同车流量获取交叉口车辆速度,同时降低相邻相位发生机非冲突的可能性。
In order to improve security of plane signalized intersections under different traffic modes, an algorothm to calculate green interval based on mixed traffic flow is developed. In order to convert vehicle speed, one of the factors affecting green interval, into traffic volume for calculation, a utility model of traffic flow which behaves well at overloaded traffic situations is applied. The rationality of this replacement method is veritied by actual speed of vehicles. Conflict points at intersections with traditional traffic modes and slow traffic integration are analyzed. An improved method of green interval based on a limit of maximum efficiency is obtained. In order to verify safety improvements, two representative design of green interval are selected as a comparison. A signal timing scheme applied at the intersection of Xiangwang Road and Huanghe Road in Suqian City is taken as a case study based on three design of green interval. Results show that the improved method can reduce possibility of collision occurrence while ensuring traffic efficiency of intersections, and has better effects on safety improvement than other method. The improved method can acquire speed of vehicles at the intersection based on different traffic flows, and reduce possibility of confliction between vehicles and non-motor vehicles by taking mixed traffic into consideration.
引文
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