中文摘要：

研究信号交叉口的运行效率及车辆服务水平对于城市交通建设与发展具有重要的意义。本文针对信号交叉口各入口方向上车流的运行特性,从概率统计的角度研究各入口方向上通过信号交叉口车流的统计模型,并在此基础上得到了一种用于定时信号交叉口拥堵的概率统计实时交通状况预警判断模型。

英文摘要：

Studying vechicles running efficiency and service level at signalized intersections is great significance to construct and develop the city transport.This paper studies the operation characteristics and the statistics model of vehicles flow on critical lane group.As a result,a probability and statistics live warning model is proposed for the traffic jam identification of fixed time signalized intersections.