两相位协调控制交叉口延误计算

延误是判断信号配时是否最优以及评价城市交叉口拥挤状况的重要指标之一。和多数文献只是研究孤立交叉口的延误计算不同,主要研究两相位协调控制交叉口,该交叉口由主、次干道相交而成,主干道处于协调控制,进口车流分为未饱和与过饱和2种状态;次干道进口车流只考虑未饱和状态,在此基础上分别对交叉口各进口道在一个周期内的延误计算公式进行推导和分析,并用具体的算例说明了公式的应用。不仅为协调控制交叉口拥挤状态的判别提供了依据,同时也对不同类型交叉口的延误计算给予了有益的补充。

Calculation Method of Intersection Delays under the Coordinated Two-Phase Signal Control

Delay is an important parameter that is used in the optimization of traffic signal timings and estimation of the level of service at intersection approaches.Most literatures Only analyze the delay of isolated intersections.Unlike it,this article mostly studies the intersection with coordinated signal control system,and the primary arterial road which is controlled by coordinated signal and the secondary arterial road compose the four-leg intersection.On the primary arterial road approaches,it considers the under-saturated and over-saturated conditions,while on the secondary arterial way approaches it only considers the under-saturated conditions.On this basis,it calculates and analyzes the delay of all the intersection approaches in a signal circle,and it also uses a specific cases to illustrate the application of the formulas.This article not only provides the basis for estimating congestion conditions of the coordinated signalized intersections,but also a useful supplement to the delays calculation of different types of the intersections.