考虑车道拥堵和排队回溢的路口信号控制模型

Signal Control Model for Intersection Considering Lane Group Obstacles and Spillover Queues

为有效应对过饱和交通对信号控制的需求,首先构建宏观交通流模型以模拟排队过程的动态演化和刻画相邻车道间车流的相互作用;在此基础上,分别建立左转和直行排队回溢阻挡下的排队长度计算模型并以两者加权求和最小为目标函数,同时约束周期时长、有效绿灯时间、路段存储能力,以此提出考虑车道拥堵和排队回溢的路口信号控制模型;最后,运用VISSIM对北京市兴华大街与清源路交叉口仿真,并对比现状方案、F-Webster-B-Cobber(F-B)方案、所提出优化方案的效果.优化方案下:路口通行能力较现状提升136 pcu/h、较F-B提升312 pcu/h;车均延误较现状降低1.7 s、较F-B降低9.6 s;各进口均未出现严重排队溢出现象.结果表明所构建的信号控制模型对单点过饱和路口应用的有效性.

For satisfying the need of signal control under oversaturated state of traffic, firstly, through the establishment of six-stage macroscopic traffic flow model, the dynamic evolution of queuing as well as the interaction between adjacent lanes could be simulated and described; On this basis the queuing length model caused by excess left-turn flow and straight flow were built respectively, and the minimum of their weighted sum was taken as the objective function, besides, the cycle length, effective green time and storage capacity of road segment were considered as constraints. Thus a signal control model for intersection considering lane group obstacles and spillover queues was proposed; Finally, the junction between Xinghua Street and Qingyuan Road in Beijing was simulated by VISSIM. Moreover, the contrastive analysis among current program, F-Webster-B-Cobber（F-B） program, and proposed optimize program was conducted. For the optimize program： 136 pcu/h and 312 pcu/h increase for intersection capacity compared with current and F-B program; 1.7 s and 9.6 s reduced average delay contrasted to current and F-B program; and none severe overflow phenomenon occurs in approaches. It shows that the proposed signal control model has good applicability for isolated oversaturated intersection.