| The urban traffic network is the basis of urban development,with the acceleration of urbanization and continuous growth of motor vehicle population,traffic congestion phenomenon has spread from point to line,line to planeand part to a wide range.How to control traffic congestion is a major issue that needs to be solved urgently.As an important node in the urban traffic network structure,thetraffic congestion ofurban entrances and exits is getting increasingly worse androad patiencedirectly affects the function of the network system.It is necessary to analyze the traffic characteristics of the multi-level road network near the urban entrances and exits and to study the road interaction between the probabilities of congestion.It can enhance effectivelythe potential capacity of road network system,making transport the efficiency and economic benefits of road networkincrease.The nature of traffic congestion is an imbalance in traffic supply and demand.Firstly,on the basis of synthesizing the domestic and foreign research results,this paper makes theoretical summary and analysis from the aspects of correlation,system series and parallel method and factors that affect the relevance of the road network.Aiming at the relationship between traffic supply and traffic demand,the multi-level road network near the urban entrances and exits is selected as the research object,and the traffic characteristics of road and road network are studied respectively.In the analysis of road traffic characteristics the concept of traffic efficiency is proposed,and the optimal density and optimal speed range of multi-level network segment are deduced by the relationship between traffic flow,speed and density.In the analysis of road network traffic characteristics,considering the complexity of road network and running randomness,this paper analysis road network traffic characteristics from the traffic flow,traffic capacity,service level and other aspects.Secondly,this paper mainly focuses on the relationship between traffic supply and traffic demandand selects the multi-level road network near the urban entrances and exits as the research object.Again,considering the complexity and running randomness of the road network,this paper analyzes traffic characteristics of the multi-level network from the aspects of traffic flow,traffic capacity and service level.Then it is establishedthat the definition and the judgment criterion of road failure.The failure probability model and the section failure assessment model are established.According to the judgment criterion of road condition,it is determined to the criterion of peak time path,OD and road network failure criterion which are based on the smoothing reliability theory.Then,the correlation model is established from the time and spatial dimension respectively,and in order to determine the road network interaction relationship,the correlation between the failure probabilities is analyzed.The time correlation model obtains the autocorrelation coefficient of the road sections at different time intervals to judge the degree of influence of the affected sections in different time intervals.The spatial correlation is related to the correlation between the relevant strength and the relevant direction.Finally,the paper takes the road network near the entrance of the Chayuan overpass inNan'an District,Chongqing City as an example to calculate the probability of failure and the degree of impact during the peak hours of the working day,and obtain the probability of failure between the section,the peak path and the ODreliability.Time and spatial relevancebetween road failure probabilitiesare calculatedquantitatively.In this paper,the concept of road failure is presented,and a series of models and calculation methods related to correlation are established on the basis of road failure.The degree of influence between sections is obtained quantitatively.The research results provide a theoretical and realistic basis for the future urban traffic management and induction work. |
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