Research On The Geometrical Design Indexes Of Highway Interchange Exit With Separation Of Passenger And Truck

With the highway reached a mutual exchange and the rapid development of the logistics industry,truck transportation plays a more and more important role in highway transportation,the proportion of truck traffic is increasing,so that the existing mixed passenger and truck highway is more and more obvious disadvantages,especially interchange nodes,with low service level and frequent traffic accidents,builders need to solve this problem.Throughout the world,the best answer to this problem is the separation of passenger and truck.In addition,the new era of hihgway basically ended.The period of renovation and expansion has already begun.Careful analysis shows that highway transformation and expansion just provide conditions for the separation of passenger and truck.There are many researches on the separation of passenger and truck at home and abroad.There are few studies on the separate interchange of passenger and truck.However,the most serious problem is the interchange exit.Therefore,this paper takes the separate interchange exit of passenger and truck as object.This paper summarizes the methods of the separation of passenger and truck,and proposes two design methods based on double combination method.The method 1,by driving the psychology principle,traffic flow theory and ergonomics as the foundation,through the analysis of driving state at the divider opening,established the divider opening length model based on the theory of bifurcation and confluence,through the analysis of the driving behavior and the response to the sign before the interchange exit,established the divider opening position model to meet the safety and comfort,and gives the recommended value.Using the VISSIM simulation model,the delay,density and traffic conflict rate as the evaluation indexes,and verifying the geometrical index.Method 2,UMRR Chain Kepler Radar Tachometer was used to collect vehicle data at the exit section.After data processing and analysis,the parameters of the two deceleration theory were recalibrated.Based on that,the relevant indexes at the separate interchange exit of passenger and truck were calculated separately.The study of this paper provides a theoretical basis for the construction of the separate interchange of passenger and truck in China,and has certain practical significance.