Abstract
The purpose of this study is to discuss the effect of rainfall, the shape of a convexity and the density of convexities on the visibility of raised-rib road marking on a rainy night, and the characteristics and the effect of raised-rib road marking were confirmed.
The summary of the obtained new results from this study is below. Firstly the convexities do not always improve the retro-reflection from raised-rib road marking on a rainy night. Secondly in order to get retro-reflective coefficient from the slope of a convexity more than marginal value it is important to keep the slope degree of a convexity. Thirdly it is effective against improving visibility to increase the weight of sprayed glass beads on the slope. Finally the height of a convexity should be determined according to rainfall, the density of convexities and so on.
