Driver´s characteristic of distance identification on freeway at night

In order to ensure enough time for drivers on freeway to acquire information at night, it is necessary to study on driver´s characteristic of distance identification at night. The quantitative impacts of driving speed, horizontal curve radius and longitudinal slope on driver´s identification distance at daytime and nighttime were studied based on comparative analysis on driver´s identification distance at daytime and nighttime under different condition of driving speed and highway alignment. The relation model was established between driver´s identification distance at night and driving speed, horizontal radius, longitudinal slope. It indicates that there is negative linear, positive logarithm, negative exponential relation respectively between driver´s identification distance and driving speed, horizontal curve radius, longitudinal slope at night.