Experimental Study on Visual Distance of Obstacles at Entrance Section of Expressway Tunnel
To study the influence of vehicle speed and layout distance on obstacle visual distance,six participants were recruited to conduct the real vehicle experiments in the expressway tunnel at three speed levels of 60 km/h,80 km/h and 100 km/h.The results show that the visual distance of the partici-pants towards the obstacles significantly decreases with the increase of speed.At three speed levels,there is a V-shaped variation trend between the visual distance and the obstacle arrangement.The shortest vi-sual distance appears when the obstacle is about 60～80 m away from the entrance,which is lower or much lower than the stopping sight distance requirement at this design speed.The partial correlation analysis shows that the running speed,obstacle position and relative distance from the entrance 70 m axis are significantly positively correlated with the visual distance of the obstacle.The research results put forward the higher requirements for the lighting transition design at the entrance section of expressway tunnels in China.
real vehicle experimenttunnel entrance sectionvisual distanceobstacle location
NETL
NSTL
万方数据
