面向T形交叉口的机动车相位固定最小绿灯时间计算

Absolute minimum green time calculation for vehicles at 3-leg intersection

面向典型的T形信号控制交叉口,建立了具有6个机动车相位和3个行人相位的相位结构。引入主相位和跟随相位的概念,从相位设置、相位组合方案、相位切换过程、相位显示顺序及其基本规律等5个方面,较为系统地阐释了相位结构的设计机理。针对有行人相位跟随的3个主相位,分析了保证行人安全过街的最小绿灯时间与相位结构、最短行人过街时间、绿灯间隔时间的数值关系。在此基础上,提出了一种适用于T形交叉口的机动车相位固定最小绿灯计算方法。该算法可以为预设时间控制方案设计和交通响应控制策略开发提供有力的支持。

A phase scheme was built for the typical 3-leg signalized intersection containing 6 vehicular phases and 3 pedestrian phases.The concepts of master phase and the slave phase were introduced,and the mechanism of phase scheme design was explained from the phase numbering,phase combination,phase switching,and phase display sequence.For the 3 master phases with slave pedestrian phase,the numerical relationship among the minimum green time of the master phase for the pedestrian crossing safely the street and the phase scheme,the minimum pedestrian walk time interval and the needed intergreen time interval were analyzed.Based on this analysis,and absolute minimum green time calculation dedicated to the 3-leg intersection was proposed.It provides a strong support for the pretimed signal timing plan and the development of traffic response control strategy.