信号控制交叉口左转车道待行区设置研究

Study on the setting methods of left-turn waiting zone at signalized intersection

利用冲突点法,以后置型专用相位左转车道的待行区为例,详细分析了左转弯待行区工作原理,解释了本向左转车辆与对向直行车辆通过冲突点附近时的相互关系.根据两冲突相位车流到达冲突点时间的先后情况,得出当交叉口清空指数小于0,左转车流到达冲突点比直行车流时间长的情况,归纳了设置待行区的适宜条件.本研究把左转待行区合理地融合进我国现有的交叉口综合控制管理中进行了有益的探索.

Based on the conflicting-point method, this paper analyses the internal mechanism of left turn flow after stopping line through taking postposition left-turn lane waiting zone intersection for instance. Meanwhile, a relation is expounded between the first left turn vehicle and the last opposing through vehicle front and back at the conflicting point. According to the successively arriving time of two vehicle flow to conflicting-point, when clearance index is less then 0, the reasonable layout approaches of left-turn vehicles waiting are researched in the paper. The results suggest that the appropriate layout of left-turning vehicles waiting area can reduce per pcu delay, increase utilization ratio of approaches and make the best of the space-time resources of intersections.