Abstract
A description is given of a road planning system in order to establish a desirable relation between land use for arterial roads and land use for urban developing areas. More cooperation between traffic planning and planning for other land uses is needed. The more important aspects of the interaction between man, vehicle, road and environment on the accident rate are discussed. Junctions, especially staggered ones, show a lower accident rate than intersections. A traffic control hierarchy is proposed, with special treatment for protection of pedestrians and which influences traffic signals, intersection spacing and street lighting.