Node Importance Evaluation Method for Highway Network of Urban Agglomeration

Urban agglomeration is a strong vitality subsystem of large regional city system with significant regional advantages in space and linked features in network. Objective and accurate assessment of each node importance of highway network is a vital part for regional road network layout planning. Problems in the existing node important evaluation methods are analyzed. And for the characteristics of urban agglomeration, urban flow intensity is included into node importance assessment indexes system. Factor analysis is used as an objective method to avoid random subjective values in node importance calculation. K-Means clustering method is used to distinguish degree level of each node importance for further analysis. Finally, central China city agglomeration is taken as an application example, and the result shows the method proposed in this paper has good practical value in application.