Describes the evolution of transportation routes and transportation methods in Pima County throughout time, and the effect that modes of transportation have had on the size and form of the community. Stage, freight, and railroad transportation followed the main historic corridors established by previous cultures and technologies.

Review of existing ordinances, studies, and articles indicates that costs associated with making homes more accessible are minimal, yet jurisdictions in other parts of the United States have tended to limit the application of "visitability" ordinances to housing that is funded by a government entity.