考虑有左转专用信号灯的交叉口车辆延误模型与算法

近年来 ,国内大中城市有些重要交叉口安装了左转专用信号灯 ,对这种路口的交通流分析迄今尚不多见 .有鉴于此 ,此文提出了有左转专用信号灯的交叉口车辆延误模型 ,详细分析了不同车道的车辆通过最大排队断面到达停车线及通过停车线时的随机过程 ,并由此得到相应的车头时距分布 .在非饱和状态下 ,当左转交通量比较大时 ,此模型可以较好地计算车辆的平均延误

Models and Algorithm of Delay in Vehicle Motionat Intersections with Left-Turning Traffic Lights

In recent years, left turning traffic lights have been installed at some main intersections in large and medium sized cities in China. However, studies on traffic flow around this kind of intersection are rare. In this paper, a model of the delay in vehicle motion at an intersection with left turning lights is established, and stochastic process of vehicle motion analyzed in details. In doing so, the vehicle motion from different lanes passing through the cross section at queue's end and stop lines is taken into account. The corresponding distribution of time headway is calculated. The results show that the presented model can be used to evaluate the average delay in vehicle motion when the flow of left turning vehicles is relatively large.