Dynamic Identification Method And Application Of Logistics Critical Road In Industrial Parks Based On BeiDou Trajectory Data

The capacity of logistics critical roads is one of the important factors determining the smooth traffic in industrial parks.Based on Beidou trajectory data,dynamic identification of logistics critical roads can ensure effective delivery and lean supply of production materials,which is an important reference value for traffic refined organization in industrial parks and their influence areas.The paper summarizes the current research status of critical road section identification methods from the perspective of different congestion characteristics,and defines the critical road sections and the factors impacting them.Compared with urban traffic flow,the mixed traffic flow formed by logistics vehicles and social vehicles has the characteristics of high mutual interference,complex traffic information changes and high possibility of congestion.Considering the current research status of critical sections and the characteristics of road system in industrial park,the logistics critical roads is defined,and its evaluation system is given in this paper.The dynamic identification model of logistics critical roads in the industrial park is constructed in this paper,including the following 3 sub-models: static structure importance model,which is used to assess the theoretical importance of road structure in the road network;dynamic traffic state assessment model,which is used to assess the actual road vulnerability under different periods;logistics attractiveness model,which is used to assess the impact of logistics vehicle convergence on road transportation in the industrial park.Meanwhile,the KANN-DBSCAN algorithm is improved to make its parameters vary dynamically with the update of Bei Dou trajectory data to solve the real-time vehicle aggregation degree in the park and to realize the dynamic update of the traffic state assessment model.Based on the case of Hongqi Industrial Park,the prediction results of the proposed identification method are compared,and the conformity of proposed method with reality is >85%,which verifies the effectiveness of the proposed identification method.Moreover,the causes of critical sections and their spatial and temporal distribution characteristics are further analyzed in this paper: 1)The distribution of critical sections formed by social vehicle congestion is random and tidal phenomenon is obvious,while the distribution of critical sections formed by logistics vehicle gathering is uniform and highly correlated with the production plan.2)The closer the roads are to the factories,the greater and more stable their criticality;the further away from the factories,the greater the fluctuation of their criticality over time.3)The influence of logistics factors on roads in industrial parks is greater than that of traffic factors in all periods.Based on the above industrial park traffic characteristics,a tailored traffic refined organization reference plan is given in this paper.