连续流交叉口信号配时优化模型  

An Optimal Timing Model for Continuous Flow Intersection

作　　者：常云涛[1] 王奕彤 CHANG Yun-tao;WANG Yi-tong(School of Traffic ＆ Transportation Engineering, Tongji University, Shanghai 201804, China)

机构地区：[1]同济大学交通运输工程学院,上海201804

出　　处：《公路交通科技》2018年第4期93-101,共9页Journal of Highway and Transportation Research and Development

基　　金：上海市自然科学基金项目(17ZR1431800)

摘　　要：连续流交叉口是一种非常重要的非传统交叉口设计,通过将主交叉口左转车流转移至次级交叉口的方式,实现主交叉口二相位控制,从而大大提高主交叉口的通行效率。为进一步发挥连续流交叉口的通行性能,对主次交叉口的信号协调控制展开理论研究,提出了一种具有普遍适应性的信号配时优化模型。该配时优化模型能够有效协调主次交叉口的信号配时,最大限度地降低车辆延误、改善交叉口通行能力,生成理想的协调配时方案,在实际应用中,能够确保主次交叉口的可靠运行。在分析连续流交叉口延误的组成和性质的基础上,深入研究了交通流延误和排队随主次信号相位差的变化情况,做相应的场景分析,再通过主次交叉口相位差优化分析,给出了最优相位差的求解方法,大大简化了模型的求解流程。最后,以南昌市某干道交叉口为例,对其进行了连续流交叉口渠化设计,利用所建立的优化模型求解协调配时方案,再通过微观仿真平台进行了交通效益评价。结果表明:所生成的配时方案能够有效降低延误和车辆排队,改善交叉口通行能力;模型计算结果与仿真输出结果相符,进一步说明该信号配时优化模型准确、可靠。Continuous flow intersection（CFI） is one of the most important unconventional intersection design（UID） modes. This kind of intersection transfers left-turn movements to secondary intersections to obtain a 2-phase signal control scheme at main intersection,so the traffic efficiency at main intersection is greatly improved. To further exploit the traffic efficiency of continuous flow intersection,the coordination of main and secondary intersection signals is theoretically studied, and an optimal timing model for general use is proposed. The optimal timing model can effectively coordinate primary and secondary intersection signal timings and produce the most effective signal timing schemes for main and secondary intersections to great extent reduce vehicle delay and improve intersection capacity,and can ensure reliable operation of primary and secondary intersections in practical application. Based on the delay compositions and their characteristics of CFI,the delay and queue process evolution with the signal offset of main and secondary intersections and the corresponding scene are analysed. Then, the method for solving optimal offset between main and secondary intersections is given by optimal analysis to simplify the solving procedure of the model. In the end,an arterial intersection in Nanchang is studied as a case of how to apply the CFI channelization design to a conventional intersection and how to apply the optimal timing model to generate the coordinate timing scheme,and the micro traffic simulation is used to evaluate the traffic benefit. The result shows that（1） the optimal timing scheme can effectively reduce delays and queues and improve the intersection capacity;（2）the model calculation agrees well with the simulation result,which proves that the signal timing model is effective and accurate.

关 键 词：交通工程 信号配时优化模型 波动理论 连续流交叉口 相位差 

分 类 号：U491.23[交通运输工程—交通运输规划与管理]