| With the gradual improvement of China’s traffic network,especially in the mountainous areas of western China,there are many tunnel groups.As a derivative of tunnel construction,tunnel groups’ operation safety problems have been perplexing road managers,law enforcement and researchers.In the tunnel group,the safety problem of the distance section of the tunnel group should not be underestimated.The light changes sharply before and after the distance section of the tunnel,the driver’s driving speed is fast,and the pavement anti-skid ability is different greatly.Therefore,the traffic safety research of the distance section of the tunnel group is the basis of ensuring the safety of the operation of the tunnel group.Awnings road managers through the spacing between sections set to ease road light environment of upheaval and pavement anti-sliding performance differences,so in the mountain west tunnel group appeared many variety,structure,diversity of awnings,but for awnings for driving people seldom study the influence of road awnings setting effect,especially in the small spacing no corresponding evaluation parameters and models.Therefore,it is extremely urgent to study the setting effect of sunshade in small distance section of tunnel group.This paper on the Chong Qing science foundation and front surface project "the group of high mountain tunnels-each section of the driver visual recognition and traffic induced mechanism research,and Chong Qing expressway group scientific research project" the silver best where high-speed period of operating in Kai Xian county(Shan Yu bound)to security key technology research,based on the real vehicle experiment and simulation experiment,collection and driving people to look at behavior,blinking behavior and scanning behavior of eye movement data were analyzed,at the same time,real car test data for tunnel group of different distance between dynamic index analysis and modeling driving human eyes get driving people visual intensity load model,The simulation experiment after setting the awning was used to verify and analyze,and the results show that the fitting effect of the visual intensity load model is good.It is expected that the sunshade will reduce the traffic accidents in the small distance section of the tunnel group,reduce the lighting loss at the entrance and exit of the tunnel group,improve the safety level of the tunnel group,and promote the green development of the traffic in the tunnel group.This paper firstly combs the traffic accident information of G65 Bao-Mao Expressway in Chongqing-Xiang section.The causes and characteristics of accidents are analyzed from the perspectives of drivers,road environment and traffic composition in the short distance between tunnel groups.Using the grey markov prediction model to predict the advantages of high precision in small cycle,forecast the future in the traffic accident,the grey markov prediction model is verified in the small spacing tunnels of road good prediction effect,and the prediction results show that the amount of traffic accidents will be increased significantly with time,provide decision-making reference for law enforcement and management department.Then this paper introduces the relationship between drivers’ visual load and various eye movement indexes,as well as the characterization parameters between drivers’ visual search patterns and drivers’ visual load.This article will yuxiang way different tunnel sections of span length,with the method of real vehicle test,research span length on the driver the pupil area,the area change rate of the pupil,looking time proportion,twitch amplitude,the pupil area maximum instantaneous change speed,visual shock duration and the influence of driver fixation point transfer rule.It is found that with the increase of tunnel group distance,the driver’s eye movement indexes gradually decrease and tend to be stable,and the driver’s visual search range significantly increases.Finally,the length of tunnel group small spacing in ChongqingHunan section is determined.Next,this paper designs and sets up sunshade and tunnel scale model.The distance lengths of 50 m,100m and 150 m are selected as simulation experimental objects to study the influence of sunshade setting on traditional eye movement indexes such as driver’s pupil area,pupil area change rate,fixation time ratio,sachet amplitude and the transfer law of driver’s fixation point.It is found that the reduced scale model can better simulate the change of light environment in the distance section of the tunnel,and the sunshade can improve the eye movement indexes of drivers,and significantly relieve the visual load of drivers in the small distance section.Finally,this paper selects seven eye movement indexes from the real vehicle test of tunnel group with different distance lengths,and carries out dimension-reduction fitting for them through principal component analysis method.Finally,a driver’s visual load model with three variables in tunnel distance segments is obtained and its threshold is determined.The validity of the model was verified by using the eye movement index of the sunshade simulation experiment.The research results show that the model can effectively represent the visual load intensity of drivers in the tunnel group distance sections,and the sunshade can effectively improve the visual load intensity in the small distance sections. |
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