Unreliable travel times cause substantial costs to travelers. Nevertheless, they are not taken into account in many cost-benefit-analyses (CBA), or only in very rough ways. This paper aims at providing simple rules on how variability can be predicted, based on travel time data from Dutch...

This paper derives a dynamic cost-benefit rule for evaluating large projects.We show that, in addition to the conventional income and consumer surplus measures, the rule also entails an extra term involving capital cost changes. -- cost-benefit rule ; large project ; capital cost