Driving-based Road Traffic Latent Risk Test And Evaluation Research

In recent years,traffic accidents caused by road traffic accidents are not uncommon,the economic losses and casualties are immeasurable,and the road traffic environment has become a main factor that affects the traffic safety.Therefore,in today's changing road traffic environment,research of road traffic environment on traffic safety influence mechanism,exploring the formation mechanism of latent road traffic risk,improving the level of road traffic safety have become a problem which needs to be solved urgently in the process of development of road traffic.Based on the National Natural Science Fund Project "Research on the formation and effect of selective attention of drivers based on risk perception",the latent road traffic risk is studied,based on the theory of multiple objective decision analysis,a comprehensive evaluation system of latent road traffic risk level was established,and the comprehensive evaluation model of risk level was constructed,and using the KMRTDS driving simulation system platform to carry out the pilot in the way of risk test experiment,the influence mechanism of latent road traffic risk to the driver's operating speed is studied,and the latent risk level model is applied in combination with the simulation experiment data.First of all,from the four elements of the road traffic system,the human,vehicle,road and environment,the influencing factors of road traffic safety are analyzed from the macroscopic and microscopic point of view.Based on the road traffic risk theory,the risk elements of road traffic environment are analyzed,and the correlation between the latent road traffic risk and the mechanism of risk is analyzed.Secondly,based on the analysis of road traffic environmental risk theory,the evaluation index and method of latent road traffic risk are determined.Take road conditions,traffic flow,road environment and climate conditions as the risk evaluation criteria,take bend,ramp and the intersection of 16 and evaluation criterion have affiliation with the elements of risk as the risk evaluation index,the comprehensive evaluation system of the level of latent road traffic risk was established.On the basis of analyzing and summarizing the comprehensive evaluation method which is widely used at present,the risk comprehensive evaluation method is determined by the combination of the analytic hierarchy process theory and the expert questionnaire survey method.Thirdly,take the identified risk evaluation index as the basis,take the four risk evaluation criterions as the evaluation criteria layer,take 16 risk evaluation indexes as the evaluation index,and establish risk evaluation index system of hierarchical structure.The relative importance of using expert questionnaire about evaluation indexes are compared and judged,constructed the layer comparison matrix.The weight value of the relative importance of each evaluation index is determined by using analytic hierarchy process,and the relative importance of each evaluation index is given.According to the results of the total ranking,the influence degree of each rating index to the decision goal was determined.Based on the above,the risk level model of latent road traffic risk is established,and the vehicle speed is introduced into the risk assessment system.A latent road traffic risk level model was constructed.Finally,using the VS-Design scenario design software,the three-dimensional simulation experiment scene of the latent risk elements in different road traffic environment is built,30 drivers were selected as subjects,and the simulation experiment was carried out using the KMRTDS driving simulation system.The operating speed data of the drivers in different road latent risk sections were extracted,and the operation speed of the drivers in different risk sections was analyzed by using the basic statistical method.The results show that the risk factors of latent road traffic risk have a significant impact on the driver's running speed;there is significant difference in the effect of different risk elements on the driver's operating speed,the difference is mainly caused by the different risk weights of different latent road risk;the same latent risk has different influence on the driving speed of the driver,the difference is mainly due to the different individuals for the latent road traffic risk of different cognitive ability.The latent road traffic risk awareness of skilled drivers is generally better than that of the novice driver's.In this paper,take the latent risk elements of road traffic as the research object,the risk grade of road traffic risk elements was evaluated quantitatively by using AHP,expert investigation and other evaluation methods.Driving simulation experiment is used as a research tool to explore the impact mechanism of latent road risk elements on the driver's running speed.This research has important theoretical and practical significance to improve the latent road traffic risk awareness and prevent the occurrence of traffic accidents.