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为向拥堵状态城市路网的交通控制优化提供依据,综述并评价了过饱和状态的交通信号控制策略;分析了过饱和状态交通流的特征,提出了过饱和状态交通信号控制的对应优化原理;从单点交叉口、协同控制交叉口及路网3个层次对过饱和状态交通控制方法进行了总结与评价,应用VISSIM仿真环境评价了已有控制策略的适用性;总结了具备处理过饱和状态能力的自适应交通信号控制系统的控制策略。仿真结果表明:过饱和状态的交通信号控制应优先优化道路空间的分配矛盾;排队管理策略对过饱和交通流具有较好的优化效果;建议在进行过饱和交通信号控制优化时,结合实时交通信息,采用排队管理、关键路径通行能力最大等控制策略,在交叉口群或路网层面对交通信号控制方案进行优化。
In order to provide the basis for the traffic control optimization of the urban road network in the congested state, the traffic signal control strategy of the supersaturated state is reviewed and evaluated. The characteristics of the traffic flow in the supersaturated state are analyzed, and the corresponding optimization principle of the traffic signal control in the supersaturated state is proposed. Summarized and evaluated the methods of traffic control with supersaturated status from single-point intersections, coordinated control intersections and road networks, and applied the VISSIM simulation environment to evaluate the applicability of existing control strategies. Finally, Ability to adapt traffic signal control system control strategy. The simulation results show that traffic signal control in supersaturated state should give priority to optimizing the distribution of road space conflicts; queuing management strategy has a better effect on supersaturated traffic flow; it is suggested that when combined with real-time traffic information , And adopts the control strategy of queuing management and maximum capacity of critical path to optimize the traffic signal control scheme at the intersection group or road network level.