Abstract
Building of the road surface conditions decision system for on the car was done by this paper. Past albedo meter couldn't cope with measuring at night because solar light was used.Therefore, this paper proposes an on-board road surface sensing system using a pair of solar cells and an additional light. From the experimental results, it is shown that the sensing system can measure the difference of road conditions, not only at daytime but also at night. Moreover, image treatment was used for the conditions of the decision which were difficult, and it coped with it only by the albedo value. The reliability of the decision rose as a result.
