交叉口左转专用信号灯对车辆延误的影响

Effect of left-turning traffic signal lights on vehicle motion delay at intersection

近年来 ,中国大中城市道路主干线交叉口采用了左转专用信号灯 ,针对这种交叉口提出了一种车辆延误模型 ,并在上海市的一个典型交叉口上进行了实测验证 ,并对比分析了车辆按均匀分布和按负二项分布通过停车线的延误结果 ,将此模型与停车线延误模型及冲突点延误模型进行了对比。分析表明 ,提出的有左转专用信号灯的交叉口车辆延误模型和相应的计算公式有一定的实用性 ,左转专用信号灯的采用 ,可以避免冲突的发生 。

In recent years, left turning traffic signal lights have been installed at some main intersections in big cities in China. A model describing the delay in vehicle motion at an intersection with left turning lights is established,and the stochastic processes in the cases of the uniform distribution and negative binomial distribution for the vehicles passing through the stop line are analyzed. The model was examined with a typical intersection in Shanghai. The comparision of the presented model with the stop line model and the conflicting point model proves that the present model is applicable. The results show that the application of the left turning signal lights could enhance the traffic capacity and to reduce the conflicts or accidents at intersections. 2 tabs,2 figs,10 refs.