Application and modeling of freeway traffic networks based on traffic flow characteristics

In order to satisfy the function demand of freeway safety management system,a data model for freeway traffic networks based on traffic flow characteristics is presented,which facilitates the GIS expression,operation and analysis of freeway traffic networks data,and offsets the deficiency of the existing GIS data model for traffic networks on modeling and analysis of complex networks.On the basis of analyzing freeway traffic flow characteristics,the author establishes fundamental modeling cell of freeway traffic networks,and designs the methods of conceptual modeling,logical modeling and physical modeling.Furthermore,this model makes for the fleet response of burst event that influences the distribution of networks traffic flow,and generation of safety management and control decisions.Finally,taking traffic closure operation position algorithm as an example,the application of the model in the field of freeway safety management is illustrated.