基于冲突分析的四肢环形交叉口信号周期计算

A Computation Method of Coordinated Signal Cycle for Four-Limb Roundabout Intersection Based on Conflict Analysis

针对四肢无信号环形交叉口通行能力不足的问题,为这类交叉口设置了八组的交通信号灯,以及相互协调的信号相位方案,使其直行车流最多一次停车,左转车流最多两次停车.详细分析这种协调信号相位的车流结构,解剖各股车流的冲突关系,在Webster周期公式的基础上,提出了这种协调信号配时方案的周期计算方法.并应用到株洲市中心广场环形交叉口的信号周期确定中.

In view of the insufficient capacity of non-signal four-limb roundabout intersection, eight sets of traffic signal are set up. Their signals are coordinated. In the coordinated signal scheme, straight flow mostly needs to stop one time, and left-turn flow mostly needs to stop two times. The composition of the traffic flows of roundabout intersection is analyzed in detail; the conflicts between traffic flows are thoroughly studied. A method of computing the signal cycle for the coordinated signal control scheme is invented based on the Webster cycle formula. This method is successfully used to traffic signal control of the Center-square roundabout intersection of Zhuzhou City of Hunan Province.