Because any investment project or upgrading in a road network will cause diversion of traffic, there will be losers as well as winners among motorists. This is particularly true in a congested urban network. A familiar example is a project which diverts traffic into a freeway or arterial, with the result that existing users suffer a deterioration in service level. This effect is tested and quantified in a hypothetical congested network. Traffic is assigned by the stochastic user equilibrium (SUE) procedure using the method of successive averages. The benefits and disbenefits are calculated on a link basis and are then related to OD traffic in order to measure how much the drivers on individual routes gain or lose. When the cost-benefit ratio is tested against the ratio of gains to losses, little or no relationship is found. This suggests that equity should be made an added consideration in road project evaluation. (a) For the covering entry of this conference, please see IRRD abstract no. E216410.
Samenvatting