Traffic Restraint as a Transport Planning Policy 3: The Effects on Different Users

Models used to simulate traffic flow and travel demand normally represent traveller behaviour by a single, averaged, group responding to cost, time, and distance changes. For systematic traffic-management measures, such as those of traffic restraint, it is desirable to examine shifts of benefits and costs between different groups of travellers. This requires equilibrium models of two or more types of traveller, each of which responds differently to charges or to travel-time changes. An appropriate technique has been developed to deal with this question, and results are presented in terms of two situations where benefit and cost transfers could arise: The effect of private parking places, and the differential impacts of road pricing.