基于车流自由度的交通子区划分问题研究

A Study on Traffic Sub-area Division Based on Traffic Freedom

为避免传统的交通子区划分方法中改进关联程度公式、周期原则、流量原则、距离原则、绿信比、相位差原则等方法的不足,引入车流自由度的概念描述协调系统内车流的离散程度,并从微观角度探究以端点交叉口的车流自由度为基准、车流自由度的变化为指标的交通控制子区的划分;同时在相对理想条件下,借助车流自由度表示在协调相位的有效绿灯时间内不停车通过的车队长度,与以端点交叉口与下游交叉口不停车通过的车队排队长度比值,从中观角度进行交通控制子区的划分;最后选取8个交叉口的实例,进行划分前后仿真,验证方法的合理性。

In order to avoid the shortage of the traditional traffic zone division method-improved connection degree formula,cycle principle,flow principle,distance principle,green ratio principle,the phase difference principle,this study introduces the conception of traffic freedom and describes the discrete degree of traffic. Treating the traffic freedom on the key intersection as a benchmark and using the change of the traffic freedom as an index,this study investigate the the problem of the traffic control sub-area division in microscopic perspective. Meanwhile under relatively ideal conditions,taking the freedom of the traffic flow to show team length in the coordination phase effective green time without stopping,and taking queue length ratio under the condition of non stop through the fleet key intersections and downstream intersection,traffic control sub-area is divided in the intermediate perspective. Finally,this study sets the eight continuous intersections as examples and compares the effect of different divisions to test the the theorical validity of this paper＇s method.