Traffic Safety Analysis And Countermeasure Research Of The Combined Section Of The Mountain Highway Line-shaped Road Section

With the rapid improvement of China’s economic level,China’s highway construction has made great progress.However,in the process of development,there are many traffic safety problems,especially in the southwest mountain highway line combination section of the traffic safety problem is very serious.These areas are more constrained by the terrain and operating costs,the highway line combination of road sections more,compared with ordinary road sections,mountain highway line-shaped combination of road sections by complex terrain,driving distance,such as limited factors,more likely to induce traffic accidents,and the severity of traffic accidents is higher.Therefore,it is of great theoretical and practical significance to carry out the identification of the key risk factors and traffic safety evaluation of traffic accidents in the combination of mountain highway line-shaped sections,and then take effective risk prevention and control measures to improve highway traffic safety.This paper focuses on the traffic safety of the mountain highway linear combination road section,taking the Kunshi Expressway as an example.Data are obtained through field investigation,actual vehicle test,accident file survey and other ways,on this basis,the characteristics of traffic accidents are summarized,the traffic risk factors of the mountain highway linear combination section are analyzed by using the sensitivity analysis method,the driving risk evaluation model is constructed,and the traffic risk prevention and control countermeasures are put forward.The main work and scientific research results of this paper mainly have the following aspects:(1)Collect the basic data of Kunshi Expressway linear combination road section(traffic volume,line design,traffic accident),and design the actual car test plan according to the research purpose.The test road segment is mainly divided into curved slope combination and longitudinal section,and collect the driving speed,cardio-physiological index and line-of-sight data of the test section according to the corresponding collection method,and the 3-magnitude criterion is applied to screen and process the collected data under the premise of confirming the sample size.(2)Based on the traffic accident statistics of the Kunshi Expressway line-shaped road section 2013～2018,the distribution characteristics of traffic accidents in the mountain highway line-shaped road section are analyzed from the aspects of time distribution,vehicle failure distribution,traffic accident pattern and weather distribution,and study the driving risk characteristics,then identify the driving risk sources of mountain highway linear combined road section from the three types of risk classification of road conditions,traffic conditions and drivers.(3)Collect vehicle driving characteristics(heart rate variability,speed and line-of-sight)data based on the actual vehicle test and identify the driving risk sources of the mountainous highway linear combination road section,study the correlation between driving load,vehicle speed and distance of view and road alignment indicators,analyze the driving safety,and then construct a fuzzy neural network risk assessment model.(4)Based on the previous research content,this paper takes Kunshi expressway as an example,and uses the identification method of traffic accident-prone sections to identify the linear combination road sections.The road risk rating is divided into four levels: highest risk,high risk,medium risk,and low risk through the driving risk evaluation model,then the highest risk and high risk road sections are matched with the locations where traffic accidents occur frequently to identify dangerous road sections along the route.Finally,from the aspects of typical engineering technology optimization and vehicle speed management countermeasures,specific suggestions for the deployment of risk prevention and control facilities were put forward.