Abstract
The relationship between repair costs for cars, trucks and buses and the degree of longitudinal unevenness of the road surface has been used by the National Road Administration in Sweden for planning road maintenance, but the availability of this type of information is limited. According to the literature, relationship models produced by the World Bank as part of the so-called Brazil study (HDM-III, which is a computer program for road planning and management, includes four alternative models for repair costs) are those most suitable for application to Swedish traffic conditions. The study reported here concerns primarily analysis and calibration of the component cost and repair time functions of one of the four models. (A)