Estimating Urban Road Congestion Costs

David M Newbery and Georgina Santos (santosg@cardiff.ac.uk)

No 147, Royal Economic Society Annual Conference 2002 from Royal Economic Society

Abstract: Economists wishing to analyse road congestion and road pricing have usually relied on link-based speed-flow relationships. These may provide a poor description of urban congestion, which mainly arises from delays at intersections. Using the simulation model SATURN, we investigate the second-best proportional traffic reduction and find that linear speed-flow relations describe network flows quite well in eight English towns, though the predicted congestion costs and charges overstate those apparently required in our second best model. We then confront the results with feasible optimal cordon charges, and find them reasonably correlated, but imperfect predictors.

Date: 2002-08-29
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