Analysis of Node Difference Degree of Expressway Network Based on Betweenness Model

Affected by development factors such as road network, economy, population, etc., the traffic distribution of expressway network nodes is uneven, and thus produce different node traffic importance. In order to measure the node importance of different regional expressway networks. First, the node betweenness model is introduced. The traditional traffic node betweenness model is optimized based on the consideration of multi-vehicle traffic weighting. Traffic importance of each node in the expressway network is calculated. Secondly, in order to measure the difference between the traffic importance of the nodes of the expressway network in various regions, the Theil index is further introduced, construct a Theil index model based on the node betweenness of the expressway network, and the Theil index model based on the node betweenness of the expressway network was revised. The exponential model is optimized and decomposed, quantitatively calculates the difference index of the traffic importance of the inter-regional expressway network nodes, and the difference index of the intra-regional expressway network node traffic importance. Finally, taking the Zhejiang Expressway as an example of the analysis object, it is calculated that the difference in the importance of the traffic flow of the expressway network nodes in Zhejiang Province not only comes from the northern and southern Zhejiang areas, but also the differences within each area are also large, respectively accounting for to 43.2% and 56.8%. The results show that the model can better calculate the distribution law and distribution degree of regional expressway network node differences, and can provide differentiated configuration guidance for road network node element resources.