交叉口可变导向车道与信号配时协同优化模型

A Simultaneous Optimization Model of Variable Approach Lane and Signal Timing at Intersection

通过交叉口可变导向车道的车道功能与信号配时的协同优化,构建优化模型,对交叉口时空资源进行优化配置,以达到交叉口车辆平均延误最小的目标。根据优化模型所得的车道功能分配和信号配时参数进行交通仿真实验,探讨可变导向车道条件下不同信号相位相序方案对交叉口运行效率的影响,并分析不同进口道以及不同流向的车流受到的具体影响。结果表明,协同优化模型能显著降低交叉口的车均延误、提高车流运行效率,并使得在某些交通量条件下使用信号优化无解的问题变为有解;同时发现不同的相位相序方案对设有可变导向车道的进口及其对向进口的左转车流运行有较大的影响,合理的交叉口相位相序设置能够有效地减少交叉口时空资源的损失。

In order to optimize the allocation of temporal and spatial resources at intersections, an opti- mization model was established. It simultaneously optimized the function of the variable approach lane and the signal timing in order to achieve the goal of minimum average delay at the intersection. To fur- ther study the impact of different signal phase sequences on the operational efficiency of the intersection in the condition of variable approach lane, traffic simulation experiments were constructed by using lane function assignment and signal timing parameters from optimized results. Based on the simulation, the impact on the traffic of different approaches and flow directions was analyzed. The results show that the optimization model could significantly reduce the average delays at intersections, improve traffic efficien- cy and make some problems that have no solutions using traffic signal optimization in certain conditions become solvable. It is found that different phase sequences greatly affect the operation of left-turn traffic at the intersection entrance with variable lanes installed and at its opposite entrance. Optimally setting up the phase sequence could effectively reduce the loss of the time and space resources at intersections.