Research On Urban Regional Traffic State Discrimination Method Based On GN And MFD

Traffic congestion is an important factor limiting urban development.With the increasing number of motor vehicles,the problem of traffic congestion is becoming more and more serious.It is no longer limited to a single intersection or a certain section,but gradually evolves from point to surface to regional traffic congestion.It has been shown that the identification of urban traffic congestion and the implementation of corresponding traffic control and management methods for different areas of congestion are effective ways to achieve regional traffic control management and effectively alleviate regional traffic congestion.The partition identification of urban traffic congestion needs to solve two problems: one is to realize the dynamic division of sub-areas according to road traffic characteristics;the other is to effectively identify the traffic status of each sub-area.In order to achieve the objectives of these two aspects,this study mainly carried out the following aspects:(1)Using the GN algorithm to divide the dynamic sub-area of the urban road network,take the edge median index to decompose the road network,use the modular function to realize the selection of the road network segmentation result,and introduce the strong connected area and the weak connected area.The concept evaluates the partition results and uses the Shenyang Road Network for simulation verification;(2)A method based on MFD for regional traffic state discrimination is proposed.Taking the total number of vehicles in the area as the abscissa,the number of vehicles in the area out of the unit is plotted on the vertical axis.Using the macroscopic basic map to analyze the bearing capacity and output capability index of the road network,the method for judging the regional traffic state is obtained;(3)Using Vissim simulation software to establish the simulation road network,by setting the basic parameters of the simulation road network,collecting the number of vehicles in the road network and the number of vehicles driving out of the road network per unit time,drawing the macroscopic basic map of the simulation road network,realizing the simulation The traffic state of the road network is discriminated.The simulation results show that the proposed method can quickly realize the identification of traffic state in urban road network area.