Safety Evaluation And Optimization Research On The Confluence Area Of Freeway Interchange

In recent years,my country’s car ownership has continued to increase,and the transportation and logistics industry has developed rapidly.The number of traffic accidents that occur within expressway interchanges has remained high,causing a large number of property losses and casualties,and the form of highway safety problems has become increasingly common.severe.The expressway interchange is an important traffic node of the expressway,which has a direct impact on the safety and driving efficiency of the entire expressway.According to statistics,traffic accidents near expressway interchanges account for as much as 30%.Therefore,this paper evaluates the safety of the geometric parameter design of the interchange confluence area,and then establishes an optimization model,aiming to improve the driving safety and efficiency of the interchange confluence area.This article first combines the industry norms and standards to summarize and analyze the relevant design parameters of expressway interchanges,and then analyzes the types,causes and locations of traffic accidents within the confluence area of interchanges.The impact of the three factors of roads on traffic safety,research and analysis of the main factors affecting the safety of traffic in the confluence area,and finally selected four evaluation indicators of horizontal and vertical line shape,running speed coordination,parking sight distance and acceleration lane length for the interchange confluence area Analyze and evaluate.And through the analytic hierarchy process,the four indicators were assigned scientifically and reasonably,thereby establishing the safety evaluation model of the intercommunication vertical confluence area,which did not lay the foundation for the optimization model below.Then,this paper establishes a chaotic genetic algorithm optimization model through genetic algorithm and chaotic search algorithm,and uses the security evaluation model to optimize the fitness function of the model.And apply this optimization model to the engineering example,according to the actual situation of the engineering example,set the value range and constraint conditions of the parameters in the optimization model,and write an optimization program based on chaotic genetic algorithm,and then use the optimization program The engineering example is optimized,and finally the optimized parameters of the optimized engineering example are obtained.Finally,Car Sim simulation software was used to model the roads in the confluence area before and after the optimization,and conduct simulation test analysis.Use the output lateral acceleration,lateral force,body roll angle,wheel vertical load,and vertical acceleration to compare and analyze the confluence area of the example projects before and after optimization,and study the driving stability and safety of the optimized interchange confluence area Whether the performance is better than before optimization,and to judge the effectiveness of the optimization model based on the chaotic genetic algorithm.The simulation results show that the driving stability of the optimized interchange junction area is significantly improved.Therefore,the optimization model based on the chaotic genetic algorithm can effectively optimize the junction area and effectively improve the traffic safety within the interchange area.Ensure the safe and efficient operation of highways.