The standard economic model for analyzing tarffic congestion, due to A.A. Walters, incorporates a relationship between speed and traffic flow. Empirical measurements indicate a region, known as hypercongestion, in which speed increase with flow. We argue that this relationship is unsuitable as a...

We present a simulation model designed to determine the impact on congestion of policies for dealing with non-recurrent congestion (i.e. travel time uncertainty).

This chapter describes how transportation demand is analyzed and what has been learned from doing so. We first present a selection of the most important transportation demand models, with an emphasis on disaggregate models because they have generally been the most successful in capturing...

Urban transportation involves imprtant nonlinearities in two ways: in its purpose and in its form of provision. Under such conditions, there is ample room for market failures and it is not surpising that public intervention plays a heavy role. But public policy failures are common too, and many...