Research On Comprehensive Assessment And Improvement Engineering Of Mountain Road Traffic Safety Risk In Mountainous Area Of Yunnan Province

Mountain roads have many sharp curves,long steep slopes,and many sections with small circular radius.In addition,there are fewer traffic safety protection facilities and poor visibility for drivers,resulting in slower vehicles and lower driving efficiency.The mountainous highways in Yunnan are scattered within complicated terrain,and there are many sections near rivers or cliffs,which are prone to serious traffic accidents,and the driving risks of mountain highways are high.At present,the research on road traffic safety mainly focuses on the design and construction of roads,but the research results of comprehensive evaluation methods for road traffic safety in mountainous areas are insufficient.This paper studies the traffic safety status of mountain roads based on This article to the South Province Yiliang(red stone rock)to Niujie(You guang kan)secondary mountain road and conducts a comprehensive study on the risk factors that affect mountain road traffic safety.The main results of this paper are as follows:(1)The video data of the accident and other regular operation are extracted to analyze traffic flow information,such as flow rate,lane density,vehicle speed,distance,time interval,etc.Lane changing behavior information,such as lane changing times,position and direction of vehicles,is extracted and analyzed.The results show that the characteristics of speed are the most significant and have the most regular pattern before and after the accident.At the same time,the main cause of mountainous highway traffic risk factor is traffic flow,and the factors in traffic flow is that vehicle speed affects the traffic flow’s change,so the major effect of the mountainous area highway traffic safety factors is actually the running speed of the vehicle.In order to achieve effective prevention and control of the risks of driving on highways in mountainous area,vehicle running speed need to be accurate predicted.(2)Based on MLP model and BI-LSTM model,time series speed prediction is carried out for mountain highway.On the basis of the prediction results,conflict identification is carried out according to the risk obtained by TTC method and the GBDT model,so as to find the highrisk sections of mountain highway that are easy to cause traffic conflicts.(3)Taking some high-risk road sections in the Yiliang-Niujie section of the mountainous area of Yunnan as the subject of the road traffic safety risk in mountainous areas.Applying the AHP-fuzzy comprehensive evaluation method to evaluate the traffic safety risk level of the high-risk road sections,so as to support engineering improvements for traffic safety.(4)According to different evaluation levels,the traffic safety conditions of tunnelentrances and tunnel-exits,sharp turns,and long steep slope sections are improved.And corresponding risk improvement measures are taken to achieve the purpose of promoting traffic safety on mountain roads.This paper analyzes the risk mechanism of the high-risk areas of mountain roads,based on the results of mountain road traffic conflict speed prediction,and traffic conflict identification results,applies the proposed analytic process: fuzzy comprehensive evaluation model to study the risk evaluation level of mountain road traffic safety,in order to construct the entire mountain road traffic.The comprehensive evaluation system of safety risks adopts different engineering improvement measures for different regions and improve both management level and service level of mountain roads.