It is well known that the visibility of road markings at rainy nights remarkably decreases. Many studies on this problem have been carried out. However, most of them have not dealt with the effect of rainfall on the visibility of road markings by means of analytical approaches.
In this paper, firstly we chose dominant factors effecting on the visibility of road markings at rainy nights, secondly made clear each effect of them by means of experimental and theoretical approaches, and finally discussed the methods of improving the visibility of road markings at rainy nights.
We were able to make clear the effect of factors on the decrease in the visibility quantitatively, and propose some improvements of the visibility.
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