Research on Visual Turbulence and Driving Safety of Freeway Tunnel Entrance and Exit

By using EMR-8B eye movement recorder,selecting driver's pupil variety of freeway entrance and exit as research object,on the basis of driving experiment,refered to the phenomena of visual turbulence during light and dark adaption,the conversion duration for visual turbulence was selected as evaluation index of driver's visual comfort degree which was used to evaluate the visual load degree and driving safety of tunnel entrance and exit.The results indicate that the driving speed should not surpass 85 km·h-1 in order to guarantee driver's visual comfort;the stopping sight distance should increase 20~30 m compared to the present standard for tunnel entrance and exit.