Study On Road Alignment And Vehicle Driving Safety Based On Traffic Accident Collision Dynamics

The number of car in China is rising year by year,and the road infrastructure is developing rapidly.At the same time,the large number of road trafic accidents highlights the seriousness of road traffic safety problems.In China,as the basis of road alignment design,the current design speed theory may lead to unreasonable road design in the practice of the limit value of the alignment design indicators.It lacks consideration of the safety of the road alignment after vehicle crash.In order to reduce the occurrence of vehicle crashes and improve the safety of the road after vehicle crash,a study on the road alignment and driving safety of vehicles after crash was completed in this paper.Through the survey data of the crash site,the driving state of the vehicle before and after crash was analyzed,which has important practical significance to the judicial judgment of the accident.On this basis,through the improvement of the line design of accident-prone road sections and the study of driving safety of vehicles,the traffic efficiency of the road will be improved and the pressure of road traffic accidents will be relieved.The vehicle crashes on the highway was taken as the research object in this paper,and research on road alignment optimization and vehicle driving safety based on collision dynamics of traffic accidents was carried out.Firstly,the dynamical model of vehicle crashes was established based on the general two-dimensional point crash.The motion state of the vehicle before and after crash was analyzed.The validity of the dynamical model on vehicle crash was verified by comparing the accident data with the highway vehicle crashes through Matlab numerical calculation and PC-Crash software simulation.Secondly,the dynamical index of driving safety of vehicles was selected,and then the vehicle-road coupling model was established in the circular curve section,longitudinal slope section and straight section respectively.The relationship between the road alignment index and driving safety of vehicles after vehicle crash was analyzed and the recommended values was proposed based on the minimum radius of the circular curve,superrelevation,slope and the distance between the outer lane and the guardrail under the road design standard.The simulation of different crashes by PC-Crash software was used to evaluate the traffic safety after road alignment optimization.Finally,the actual situation of an accident-prone section of the highway in Xiamen City was taken for example,a fault tree model of the vehicle after crash was established,and the lateral stability of the vehicle after crash was analyzed comprehensively from road design,driver factors,vehicle factors,and environmental factors by using probabilistic mathematical analysis method.The road alignment related indexes was optimized in the paper from the perspective of the mechanics of vehicle crashes,and the risk influencing factors after vehicle crashes was analyzed through fault tree method,so as to provide a reference basis for the improvement of road alignment design,which has a more important guiding significance for the development of the measures of driving safety of vehicles.