THE AADT-KILOMETRE FORMULA FOR ESTABLISHING BULK-SERVICE CONTRIBUTIONS TO THE PROVISION OF ROAD INFRASTRUCTURE IN URBAN AREAS

Bulk service contributions are often levied by municipal and local authorities responsible for the provision of road infrastructure with the aim of recovering some or all of the cost of the impact of the trips generated on the road network. In South Africa, such contributions are normally established on the basis of the peak-hour trip generation of a development. In this paper, a formula is proposed whereby the developer contribution is calculated based on the AADT-kilometres of trips generated by a development. The bulk service contribution calculated by the formula is therefore in proportion to the overall use of the road network (taking into account peak and off-peak trips).