Research On Dynamic Partitioning Method Of Traffic Control Subarea For Different Traffic Conditions

A lot of convenience to people’s lives have been brought by the rapid development of social economy and the increasing number of car ownership,but also that many problems have been brought to the urban traffic.Traffic control subarea partition was originally developed along with the development of traffic planning.With the increasing traffic congestion problem in urban road network,and the traffic signal control facilities at road intersections are improved,traffic control subarea partition based on urban road signal control network has gradually become a hot research.The research content of this paper is the dynamic partition method of traffic control subarea in different traffic conditions.In this paper,the traffic control subarea is taken as the object of research,and it is based on the sections between adjacent intersections.The research of this paper mainly studies from three aspects including Traffic correlation index of adjacent intersections,the automatic partition of the initial traffic control subarea,and the dynamic adjustment of the traffic control subarea.And the specific research contents are as follows.First,based on the previous research on traffic correlation index model,this paper makes an in-depth analysis on the traffic situation under different traffic conditions.Then,the traffic correlation index model of adjacent intersections is established,and its rationality and superiority are also verified which lays the theoretical foundation for the dynamic partition of traffic control in urban road network.Second,based on the established traffic correlation index model of adjacent intersections,graph theory and spectral clustering algorithm are used as the theoretical basis,and combined with the traffic characteristics of road network,in this paper,a multi spectral clustering partitioning method of automatically determine the number of traffic control subarea is proposed,that is the multi spectral clustering automatic partition method of traffic control subarea.In this paper,the method is compared and verified by an example,and use the traffic control subarea correlation compactness index,correlation loss index and critical section continuity index to evaluate these methods.Third,this paper analyzes the influence of different traffic conditions on the traffic control subarea dynamic adjustment of urban road network.And through the combination deeply of map segmentation theory and the actual traffic,this paper proposes a dynamic adjustment method of traffic control subarea,including traffic control subarea small adjustments,segmentation and merging.It is proved that the method can achieve good results by an example which is used to compare and verify the situation that before and after the dynamic adjustment of traffic control subarea.