Abstract
A study has been made into the relationship between road surface unevenness and the relative number of traffic accidents on different kinds of roads outside the built-up area in the province of Noord-Brabant. There exists a statistical relation between the road surface unevenness and traffic accidents. If the unevenness is high, the number of accidents is low. The unevenness of the road surface is an important factor in the contact between tyre and the road. The road administrator should maintain a certain degree of unevenness. The effects of a better road surface unevenness on traffic are discussed.