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交通拥堵事故多发生于路网局部,严重拥堵或多个局部同时拥堵可能引发次生拥堵,对城市交通造成破坏。通过引入BPR函数Davidson修正模型及公路道路服务水平的概念,对路网路径运行时间进行分析。由于路网结构的复杂性以及道路特性的差异、交叉口交通流的动态变化,出行者面对拥堵时选择出行路径的难度加大,导致其在路网交通情况正常时所确定的最优出行路径并不一定是交通拥堵情况下的最优选择。在考虑所选路径可靠度的基础上,建立了交通拥堵下城市路网的静态交通分配模型并进行了算法算例求解,用模型从宏观角度分析城市交通,为缓解城市交通拥堵提供参考。
Traffic congestion accidents occur in the local road network, severe congestion or multiple local congestion at the same time may lead to secondary congestion, causing damage to urban transport. By introducing the BPR Davidson correction model and the concept of highway service level, the running time of road network is analyzed. Due to the complexity of the road network structure and the difference of the road characteristics, the dynamic changes of the traffic flow at the intersections make it more and more difficult for the travelers to choose the travel route when confronted with traffic congestion, resulting in the optimal travel determined by the traffic network in normal conditions The path is not necessarily the best choice in the case of traffic jams. Based on the reliability of the selected route, a static traffic assignment model of urban road network under traffic jam is established and the algorithm is solved. The model is used to analyze the urban traffic from a macro perspective and provide a reference for relieving urban traffic congestion.