基于单点立交思想变形后的环形立交通行能力研究

基于单点立交的思想,将环形立交中环形转向车道上的连续、交织运行流变形为灯控平面交叉口模式下的分时间段车流,列举了3层十字环形立交变形后的6种典型车道布置方式,根据道路交叉口通行能力最新的观测成果和计算方法,对其通行能力进行了理论分析和计算.结果表明变形后的环形立交通行能力有较大幅度的提高,同时变形环形立交的占地面积相对减小.

Study of traffic capacity about alterant rotary interchange based on SPI

This paper advances a method which can change continuous intertwine traffic flow on rotary lanes in rotary interchange into interval traffic flow like that kind of flow in signalized intersection by using design theory of single point interchange.In the paper,after representing six typical lanes arrangements combining with the foregoing method in cross three-floor rotary interchange,the paper analyses each capacity of rotary interchange with different lanes arrangements according current survey results of intersection capacity.The results of the analysis indicate this method is effective which can not only greatly induce capacity of rotary interchange but only relatively reduce area of construction land.These results also can be used to aid interchange design schemes priority whether the interchange is new one or rebuilt one.