Abstract
This study investigated legibility and readability for road signs under static and dynamic conditions. They were measured by varying the distance between the road sign and subjects. The results showed that (a) there are some ranges of maximum distances with respect to percent contrast or luminance ratio of a randolt ring to its background; (b) visible distance threshold increases with the increase of luminance of white field except percent contrast of 100 percent; (c) dynamic acuity decreases with the increase of target speed under all conditions of luminance of target. (d) in night driving, readability for the road sign decreases with the increase of car speed at relative small luminance difference between the road sign and its surroudding field.
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