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根据网络交通拥挤的特征,利用交通波理论研究了交通拥堵形成的临界条件.首先分析了单车道信号控制路段的交通波传播特性,建立了过饱和形成的临界条件.然后针对基本路段拓扑结构特征,将基本路段分解为一系列单车道路段,在此基础上研究了复杂条件下交通波传播规律,并考虑了3种复杂因素,建立了相应的交通拥挤形成临界条件,包括不足的绿信比、渠化区上溯以及路段内部出入口交通流的影响.研究结果显示,路段的物理结构、交通流需求结构以及信号设置均会影响到交通拥堵的形成和扩散.研究结果为路网拥堵的控制提供了一定的理论基础.
According to the characteristics of traffic congestion, the paper studies the critical condition of traffic jam formation by using traffic wave theory.Firstly, the characteristics of traffic wave propagation in a single lane signal control section are analyzed and the critical conditions for the formation of supersaturation are established.According to the topological features , The basic road sections are decomposed into a series of cycle sections, and on this basis, the law of traffic wave propagation under complex conditions is studied. Three kinds of complicated factors are considered, and the corresponding critical conditions of traffic congestion are established, including the shortage of green ratio , The upstream of canalization area and the traffic flow inside the roadway.The results show that the physical structure of the road section, the demand structure of traffic flow and the signal setting will all affect the formation and spread of traffic jam.The research results provide the control of road network congestion A certain theoretical basis.