Research On Control Strategy Of Highway Queuing Vehicle Based On Traffic Wave

With the continuous extension of the highway mileage,how to improve the efficiency of road network and enhance traffic safety has gradually become one of the core issues of highway operation and management.In case of emergency,qualified control strategy of queuing vehicle can effectively relieve traffic congestion,reduce driving delays,and avoid the occurrence of secondary accidents as much as possible.Therefore,it is of practical value and significance to study the vehicle control strategy under emergency and provide decision support for highway operation and management department.In this paper,under the conditions of short-term accident on the highway and when the lanes are all closed,a segmented control strategy of queuing vehicle is proposed and compared with the traditional single-point control strategy.Based on the traffic wave theory,vehicle build-up and dissipation model of two strategies is established respectively.And through the Vissim simulation the exactness of the models can be verified,and the comparison and evaluation of the two control strategies can be completed.The specific research contents are as follows:Firstly,this paper analyzes the applicability of the common statistical theory models of traffic flow,and it is found that Van Aerde four-parameter model can describe the parameters of highway traffic flow well.Based on the measured data,the Van Aerde model is modeled by calibrating the four parameters.And based on the basic wave velocity formula of traffic wave theory,the traffic wave model under Van Aerde model is established.Secondly,the influence scope of the time and space of queueing vehicle in the highway accident section is defined and analyzed.And based on this,build-up and dissipation model of single-point control and segmented control strategies are established based on traffic wave theory.This paper takes the queueing wave and starting wave of queuing vehicle as the entry point,and catching-up question is used to build a mathematical formula.Combined with accident cleaning time and vehicle arrival speed,the maximum queue length and queuing time of vehicles are solved.Also,the dissipating time of queuing vehicle is solved by combining the dissipating wave of queuing vehicle.Based on above,the model is established.At the same time,the position formula of control points under segmented control strategy is derived.Finally,a set of example calculation and simulation verification are carried out to complete the verification of model and the evaluation of segmented control strategy.The results of the study show that the error between the calculated and simulated values of the parameters of the build-up and dissipation model of queuing vehicle under the single-point control and the segmented control strategy established in this paper is between 0.5% and 7.7%,which means the accuracy of the model is very high.Compared with the single-point control strategy,the parameters such as the maximum queue length,the dissipating time and the average traffic delay of queueing vehicle under the segmented control strategy are reduced by between 14.8% and 21.3%,and the total traffic delay is reduced by 129 h,which verifies the feasibility and effectiveness of the segmented control strategy.