Research of Lighting Level by Urban Expressway Visual Cognition Demand of Lane-change
In order to improve the visual environment and the high-risk conditions of lane change at night of urban expressways by means of lighting,the visual cognition targets and sight distance demand of changing lanes by drivers were analyzed.The static and dynamic visual cognition tests of small targets were conducted on 24 drivers.The influence law of pavement luminance on static visual cognition under different color temperature conditions was studied as well as the influence of pavement luminance on dynamic visual cognition under 4 000 K color temperature conditions;According to the static cognition law,the dynamic cognition results were corrected to get the lighting lu-minance level that meets the driver's lane change cognition needs under different color temperature conditions.The results show that the road surface luminance level required by the driver to statically recognize small targets at dif-ferent color temperatures is different under a certain distance condition;Under 6 000 K color temperature,the driv-er's dynamic visual cognition distance of small targets increases with the increase of road luminance level;Under different color temperature and speed conditions,the dynamic road surface luminance level required by the driver is different.When the color temperature is 6 000 K,the road surface luminance level is the lowest.The study provide a reference for the design and operation management units of urban expressways to improve the high-risk situation of lane change behavior.
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