It is crucial to studying the propagation patterns of urban traffic congestion in alleviating traffic problems. A propagation model of urban traffic congestion based on the SIR to analyze the propagation process of urban traffic congestion was established. Firstly,the road dual topology network was constructed according to the actual urban road network. The traffic congestion propagation model was developed based on the SIR. Considering the complex network characteristics of road networks and the relevant attributes of roads themselves,the random forest algorithm was introduced to compute the corresponding weights,determining key parameters such as the propagation rate in the congestion model. Subsequently,using a specific area road network in Qinhuai District,Nanjing City as an example,a city road dual topology network with 69 nodes and 163 links was constructed for sim-ulation experiments. The results indicated that road node degree and road saturation were key factors influencing the spread of road congestion. The impact of road node degree was relatively small,with the propagation range increasing by within 5％ and the recovery time being affected by around 10％. In contrast,the impact of road satu-ration was relatively large. As saturation increased,the propagation range could grow by up to 40％,and the recov-ery time could be affected by around 20％.
关键词
SIR模型/城市交通/拥堵传播/道路节点度/道路饱和度
Key words
SIR model/urban traffic/congestion propagation/road node degree/road saturation
维普
万方数据