Samenvatting
Over the past several decades planning, research and training in the highway field haven been characterized by a con- tinuous broadening in concept,scope and methodo Advances in mathematics have provided us with greatly impDOved toolso Ho less important is the infusion of condetps of sociology,economics,and other social sciences that have afforded new insights into the broader purposes that must be served by transport systems. The increasing use of the motor vehicle with the resultant traffic conditions in our cities and towns, effects the whole community both social1y and economically. This is a natural by-product of the 20th eentury world.