Research Of Key Nodes And Important Sections Of The Road Network

City road network is the skeleton and the running artery of a city, whether the arrangement is clear, the structure is reasonable and the capacity is reliable or not, are the key factors of whether playing city road resource utilization rate and improving the running efficiency, so the city’s road network structure has important influence on the city traffic. The distribution area of city road network is very extensive, which is extremely vulnerable to earthquakes, floods and other natural disasters. The disaster is easy to cause the network congestion and even complete paralysis of large area, which will cause heavy economic losses. Therefore, for the administrator of road network, find out the key nodes and important sections that support network through the analysis of the existing road network topological structure after the network size is determined, and perform effective management and protection of the key nodes and the critical sections, thereby avoiding the whole network breakdown of the road network, is a simple and effective way of relieving the city traffic jam problem.Based on the above analysis, the key nodes and important sections of the city road network are studied in this article. Starting with the research status at home and abroad of the key nodes and important sections, this article performed comparative analysis of the evaluation indicators and evaluation methods of complex network and road network, which provided theoretical basis for the study of the network key nodes and important sections. Afterwards, put forward the definition of the key nodes and the important road sections based on the previous theoretical analysis, and the evaluation index of the network key nodes and important sections based on the network topology and traffic flow characteristic. Finally the evaluation models of the network key nodes and important sections are established. Based on the above, taking Beijing regional rode network as object, identified the key nodes set and the important sections set of Beijing regional road network after analysis. Performed impact analysis on selected typical key nodes and important sections, and proposed management suggestions of the key nodes and important sections respectively. The evaluation model of the key nodes and the important sections was proved effective and practical in the actual road network through the example analysis, but also laid theory and application foundation for the further research of the key nodes and important sections in the future.