Research On Traffic Safety Guarantee Technology Of Small Net Distance Tunnel Entrance And Exit

In recent years,the number of expressway projects in mountain areas in our country is increasing gradually.The net distance between tunnels is limited by geographical environment and so on,forming tunnel sections with smaller net distance.At the same time,there are more traffic accidents in tunnel sections with smaller net distance.At present,there is no systematic study on the safety protection of tunnel sections with small net distance in our country,and the current research results cannot meet the requirements for the safe formation of vehicles in tunnel sections with small net distance.Therefore,it is necessary to conduct an in-depth study on the safety guarantee of tunnel sections with small net distance.In this paper,the concept of small net distance tunnel section is first put forward from the driver’s traffic behavior when driving in the tunnel section with small net distance,and the small net distance tunnel section is defined.By analyzing the accident data of small net distance tunnel,the spatial,temporal and weather distribution characteristics of the accident are obtained.On the basis of analyzing the traffic environment characteristics of the tunnel sections with small net distance,the traffic flow characteristics of the tunnel sections with small net distance are obtained by using the measured data of vehicle running speed,etc.Through designing a visual reference transition test scheme and using simulation driving simulation,the speed perception of drivers in different visual reference systems,as well as the data of vehicle speed and lateral position,are obtained.The visual reference characteristics of drivers in small net distance tunnel sections are analyzed and obtained,which provide data and theoretical support for the later traffic safety technology.Secondly,starting from the small net distance tunnel traffic environment,driver’s visual characteristics and light transition at tunnel entrance and exit,combined with the spatial characteristics of accident distribution,the corresponding traffic safety guarantee measures are proposed.Different treatment measures are proposed from four aspects: vision guidance technology,light transition improvement technology,speed control technology and lane keeping technology.Visual guidance technology under different frequency edge rates is proposed to help drivers to sense the speed and define the road line type.It is suggested that the distance and length of shading transition facilities,which can save cost and energy,should be reduced,and the light and shade adaptation time of drivers should be reduced.It is also suggested that interior paint and ceramic tiles should be carefully used,and tunnel driving warning signs should be set to improve the light transition at the entrance of the tunnel.It is proposed that the lane change ban marking in the tunnel should be implemented according to the actual demand,and the lane change ban area should be explicitly allowed and prohibited in front of the tunnel to ensure the driving stability and safety of vehicles.Asymmetric edge markings are proposed to control driving speed and lane keeping to ensure driving stability.Finally,the anti-skid technology of entrance and exit section pavement with color anti-skid pavement is proposed.The research of this paper has made a technical contribution to the safe operation of small net distance tunnel sections and is of great significance for improving the safety of driving in small net distance tunnel sections.