信号控制交叉口周期时长对饱和流量的影响研究

交叉口是城市交通的瓶颈,也是交通拥挤现象的集中体现点。为缓解交通拥堵的压力,不少信号控制交叉口采用了加长周期的做法,从而出现了越来越多的160s、180s甚至超过200s的信号周期。但是,在长周期的情况下,车道的饱和流率是否稳定有待于深入解析。该文通过理论分析、实际调研、仿真测试三个层面的研究,对有、无扩展车道情况下的直行车道绿灯时长对饱和流量的影响做了系统深入的研究,研究表明当绿灯时段内通过停车线的车辆数刚好达到15pcu时可以得到最大的饱和流量。

Study of Influence of Long Cycle on Saturating Flow at Signal Control Intersection

The intersections are the bottle necks of the city traffic,are also the centrally embodying point of traffic jam. In order to relax the pressure of traffic jam,the lengthening cycle method is used at many signal control intersections so as to present more and more signal cycles,i.e. 160s,180s,even exceeding 200s. But under the condition of long cycle,it is to deeply analyze how to stabilize the saturating flow rate of lane. Through the study of three aspects of theoretic analysis,practical investigation and study,and imitating test,the article carries out the systematically deepening study of the influence of the long-time green light for the upright lanes on the saturating flow under the condition of the expanding and non-expanding lanes. The study result makes clearly that the maximum saturating flow can be given when the number of vehicle passing the parking line within the green lighting time exactly reaches 12 pcu.