Study On The Safety Utility Of The Combination Scheme Of Traffic Facilities In Mountainous Area

There are many bad linear sections such as sharp turns,steep slopes and insufficient sight distance in mountainous highways,which become the weak nodes of road traffic safety.Therefore,based on ergo lab physiological and psychological instrument,I-View hed4 eye tracker,kmrtds driving model system platform and other equipment,this paper constructs the driving simulation scene of bad alignment of mountain highway,and conducts nine combination schemes(warning + speed limit + slow)safety effectiveness experiments on five types of traffic safety facilities(warning signs,speed limit signs,slow signs,deceleration markings,guardrails),This paper analyzes the driving behavior characteristics of drivers under the influence of nine combination schemes,and puts forward the evaluation method of the safety effectiveness of the combination scheme of traffic safety facilities,so as to provide reference theory and method for improving the traffic safety level of mountainous highway.(1)This paper analyzes the relationship between road factors and accidents,and constructs a typical driving simulation scene of bad alignment of mountainous highway.Through screening,a total of 26 drivers were recruited to carry out driving simulation experiments under the influence of nine combinations of traffic safety facilities,and their eye movement data,physiological and psychological data,operation behavior data and vehicle running state data were collected.(2)Under the combination scheme of traffic safety facilities,the driver’s eye movement,physiological and psychological experimental data from the first observation of traffic safety facilities to the bad alignment road section are extracted,and the steering wheel entropy,comprehensive braking,Markov chain and other methods are analyzed and counted according to the above experimental data.The results show that: under the nine combination schemes of traffic safety facilities,there are obvious differences in drivers’ driving behaviors,mainly in the distribution index of fixation times and fixation steady distribution index,and the drivers’ eye movement behavior patterns are similar;The steering wheel entropy,throttle utility and brake utility have weak positive correlation among some combination schemes,and the difference of driver’s operation behavior is significant;The results showed that the overall physiological and psychological indicators showed weak positive correlation,and the stimulus response trend of each combination scheme was the same,but the impact on the physiological and psychological indicators of drivers was different.(3)This paper puts forward the evaluation system of the utility of the combination scheme of traffic safety facilities,determines the quantitative standard of the evaluation index according to the "quota standard method",and establishes the entropy weight matter-element evaluation model of the utility of the combination scheme of traffic safety facilities.Finally,based on the entropy weight matter-element evaluation model,the fixation transfer rate,comprehensive braking index,throttle efficiency,steering wheel entropy and heart rate change rate of each combination scheme are evaluated.The results show that: the combination of three types of traffic safety facilities(warning signs,speed limit / deceleration signs and guardrails)has excellent safety effect,and the driver can operate smoothly and concentrate;The combination scheme of two types of traffic safety facilities(warning signs and speed limit signs,guardrails,etc.)has good safety effect and meets the driving information needs of the test subjects,but there is a problem of insufficient protection in real life;The four types of traffic safety facilities(warning signs,speed limit signs,deceleration markings and guardrails)have general safety effect,and drivers will judge the road safety level is high and relax their vigilance.