This chapter focuses on methodological findings and issues with particular emphasis both on the progress with and on the problems of modelling these systems. It describes what might be considered to be a more philosophical approach, offers some comments on the development and use of these techniques in the context of a more general view of planning, science, and society. Development patterns from before and after the construction of the interchanges were also analyzed, along with existing local controls. "A beltway can increase development opportunities in its corridor, reinforce prevailing urbanization patterns, and facilitate compact development.”The most significant policy implication of the findings on beltway impacts on development is that a coherent and effective land use policy is required to control beltway–induced development in growth areas and to enforce conformance with local land use plans and objectives. The development of a new transportation facility in a declining area will not, by itself, suffice to stem or reverse the decline.