干道交通协调控制的MILP改进算法

为了优化存在瓶颈交叉口干道的协调效果，采用数解算法对干道协调算例进行分析，提出了干道瓶颈交叉口严重制约绿波带宽度的问题.以绿波带宽度最大化为目标，将瓶颈交叉口等效为直行道路，利用数解算法求解等效之后干道的绿波协调参数；以通行能力最大化为目标对瓶颈交叉口建立动态控制模型，计算合适的瓶颈交叉口相序和相位时间，保证干道协调车流不停顿地通过瓶颈交叉口；最后，利用VISSIM交通软件对算例进行仿真，采集车辆在干道的平均旅行时间和瓶颈交叉口的车辆通行能力.仿真结果表明：提出的协调模型与原经典数解算法相比，绿波带宽度增大8.0%，车辆平均旅行时间减少8.9%，瓶颈交叉口通行能力提高5.1%，有效改善了实际中存在瓶颈交叉口干道的协调控制效果.

An improved algorithm for arterial traffic coordinated control based on mixed integer linear programming

To optimize the coordination effect of the arterial road with bottleneck intersections, the topic that the width of the green wave belt is seriously restricted by the bottleneck intersections was proposed through analyzing an example employed in the classical algebraic method of the arterial road coordinated control. With the aim of maximizing the green band width, the bottleneck intersection was equivalent to the straight road, and the green wave coordination parameters of the arterial road was solved by using the algebraic method after the equivalent. Then, the bottleneck intersections dynamic control model was established with the purpose of maximum traffic capacity, which calculated the suitable phase sequence and appropriate phase time. It is effective to ensure that the traffic flow of arterial straight roads was not interrupted at the bottleneck intersection. Finally, the VISSIM traffic software was used to simulate the example, to collect the average travel time of the vehicle and to compute the traffic capacity of the bottleneck intersections during the simulation. Results show that compared with the classical algebraic algorithm, the green band width increases by 8.0%, the average travel time of the vehicle is reduced by 8.9%, and the bottleneck crossing capacity is improved by 5.1%, which tremendously improves the effect of the arterial road coordinated control with bottleneck intersections in practice.