基于可靠度的城市道路交通信号配时优化研究

Research on Timing Optimization of Urban Road Traffic Signals Based on Reliability

摘要:

城市道路交通是城市运行的血脉，交通信号配时优化是解决交通拥堵、提高交通效率的重要方法。近几年，交通可靠度被广泛应用于城市道路交叉口相关研究中，现有的可靠性研究多采用定义交叉口可靠性指标来评价城市交通系统信号控制设计，并对存在的问题进行分析优化。描述信号交叉口的指标有行程时间、排队长度、相位清空和服务水平等，相位清空可靠度研究对于优化交叉口信号配时方案具有一定的重要性。在现有研究理论的基础上，基于传统的MAXBAND绿波带控制模型，同时结合交叉口可靠度模型进行优化，建立了基于可靠度的干线协调优化控制模型，并采用粒子群算法求解。以实际案例为研究对象，采用VISSIM仿真得到平均延误时间和排队长度。研究结果表明，基于可靠度的干线协调优化控制模型求解得到的信号配时方案优于传统的MAXBAND绿波带控制模型的结果。

Abstract:

Urban road traffic is the lifeblood of urban operation. The timing optimizing of traffic signals is an important method to solve the traffic congestion and improve the traffic efficiency. In recent years, the traffic reliability has been widely applied in the related research of urban road intersections. The definition of intersection reliability indicators is mainly adopted in the existing reliability research to evaluate the signal control design of urban traffic systems, and analyze and optimize the existing problems. The indicators for describing the signalized intersections include the travel time, queue length, phase clearing and service level, etc. The research on the reliability of phase clearing is of certain importance for optimizing the signal timing scheme of intersections. On the basis of the existing research theory, based on the traditional MAXBAND green wave band control model and combined with the intersection reliability model for optimization, a mainline coordination optimization control model based on reliability is established and solved by using the particle swarm optimization algorithm. Taking an actual case as the research object, the average delay time and queue length are obtained through VISSIM simulation. The research results show that the signal timing scheme obtained by solving the mainline coordination optimization control model based on reliability is superior to the results of the traditional MAXBAND green wave band control model.