基于间距临界值的短连线交叉口信号优化方法

应用美国NEMA标准和Paramics 仿真，首次引入间距临界值的概念，研究短连线交叉口的信号控制优化方法.首先，基于交通特性分析，按照信号控制方式将短连线交叉口分为信号合并和信号协调两类.进而构建短连线交叉口的信号控制方式选择模型，通过两个交叉口间的间隔距离与临界值的比对来判断信号控制方式的类型.基于美国NEMATS-2 标准中提出的双环相位结构，分别建立两种控制方式对应的信号相位相序设置策略和信号配时方法.最后，利用Paramics 交通仿真软件对实际调研的两处典型短连线交叉口的现状交通方案和优化改进后的方案进行仿真分析.得到的仿真评价指标结果表明，改进方案达到了优化效果，同时也说明提出的短连线交叉口信号控制方法有效且可行.

Signal Control Optimization for Short Length Intersections Based on Critical Distance

This paper regards the short length intersection as the research object. It is actively explored to find the methods of intersection signal control and the plans of traffic management using NEMA standard, PARAMICS simulation software and critical distance. Firstly, the short length intersection is classified into two typical types, including merging signals and coordinated signals, based on traffic characteristics analysis. Secondly, a selection model is established for the mode of signal control. The mode of control is judged by comparing the distance between two intersections and the critical value. Based on NEMA TS- 2 Dual- Ring- Barrier phase structure, the corresponding signal phase setting strategy and signal timing method are put forward for the two kinds of different control modes respectively. Finally, the traffic simulation software of PARAMICS is used to analyze the current traffic scheme and the optimized scheme of the two practical investigated close quarter intersections. Through the simulation evaluation index, the optimized results are proved. Meanwhile, it is actively proved that the methods and theories of short length intersection in the research are effective and feasible.