Study On The Validity Of Mountain Road Deceleration Marking Line Based On Physiological Index

The safety evaluation of the traffic risk section is very important.Through the evaluation of the traffic safety facilities laid on the road section,risk prevention measures can be proposed to improve the safety level.At present,the deceleration markings are mainly arranged in dangerous sections such as highway sharp bend sections,tunnel entrances and exits,toll plazas and uncontrolled intersections of trunk roads,and their types mainly include fishbone shape and horizontal/longitudinal visual illusion deceleration.Marking,angle-shaped deceleration markings and comb-shaped deceleration markings,etc.Therefore,it is necessary to evaluate the effectiveness of the deceleration marking.Based on the National Natural Science Foundation of China and the Chongqing Graduate Research and Innovation Project,this paper captures the horizontal/longitudinal visual illusion deceleration line by collecting data such as vehicle running speed,driver eye movement characteristics and driving trajectory.Comprehensive analysis of design parameters,vehicle operating state,driver’s visual behavior and trajectory lateral deviation degree,and obtain the evaluation and improvement opinions of the marking effectiveness of the degraded line segment of mountain roads,in order to reduce the occurrence of traffic accidents and improve road traffic safety.Level.The deceleration marking line is usually laid on the roads such as ramps,urban road intersections,sharply curved steep slopes,long downhill slopes and S curved road sections.This paper firstly studies the road sections,safety facilities and environment based on a large number of road sections in Chongqing,Guizhou and Sichuan.Factors such as road traffic accidents were analyzed in many aspects.Different types of deceleration markings were introduced.The factors related to driver’s pupil size change,fixation point distribution,fixation time and fixation time were analyzed.The potential impact of human visual psychology,determine the test section type,trajectory parameters and eye movement characteristics analysis indicators.Secondly,according to different design speeds and road grades,the research objects are classified,and the actual vehicle test is used to study the horizontal and vertical deceleration marking lines on the representative roads of urban expressway,intersection,straight section and curved section.The driving trajectory of the vehicle,the driver’s vision,and the influence of psychology.Using the eye tracker,driving recorder,drone aerial equipment,radar speed gun and wheeled range finder to obtain relevant experimental data,using statistical analysis methods to test the test data of the test section and the comparison section,for different sections The characteristics of traffic flow,driver’s physiological behavior index and trajectory distribution are analyzed.The results show that setting the deceleration marking can reduce the average speed of different sections of the section by 7.39%~10.15%.The mean value of the diameter of the pupil is: the straight line is the smallest,followed by the Egongyan,Mingjia,S,and horizontal.The test section of the deceleration marking line and the test section of the longitudinal deceleration marking line have the largest pupil diameter in the test section of the horizontal and vertical combined deceleration marking line.After the deceleration marking line is set,the number of gaze points of the driver increases,the frequency of fixation increases,and the attention to the surrounding environment is increased.Ascending,the diameter of the pupil is increased,and the front view plane of the driver is divided into six areas,such as the left front,the right front,the left front,the far right front,the near front and the far front,and the vehicle travel track offset is regulated.Finally,the paper combines the influencing factors of the effectiveness evaluation of deceleration marking,scientifically selects the evaluation index,constructs the visual behavior trend surface model,analyzes the causal relationship between the various elements,and proposes the evaluation method of the deceleration marking effectiveness based on the entropy weight element.According to different road sections,comprehensive evaluation and suggestions for improvement of deceleration marking design parameters,vehicle operation index,driver status index and driving trajectory are carried out.Based on the evaluation of the effectiveness of the deceleration line,the paper analyzes the basic influence of the deceleration line on the speed,physiological behavior and lateral displacement of the vehicle from the driving environment,trajectory characteristics and driver’s visual psychological characteristics of the test section.The eye movement characteristics and lateral displacement of the trajectory provide theoretical basis and data support for future low-cost safety and security measures for road traffic.