ABSTRACT
Alternative transportation infrastructure improvements necessitate the evaluation of equilibrium outcomes both with and without the improvements across the alternatives. Transportation, however, is a derived demand. That is, it is directly linked to the products transported and, hence, depends on the spatial differences in the origin and terminal locations. The products travel from origin to destination over transportation networks and geographic space. The transportation may be provided by different modes that may compete with each other or may be essential to completing a service, and, therefore, have both substitution and complementarities across modes. There are few models that have the capacity to integrate some or all of these factors into an equilibrium framework.
