The Sun Corridor megaregion consists of Maricopa, Pima, and Pinal counties. The Sun Corridor Value Impact Analysis (VIA) project is developing an approach and toolkit to measure the economic value-added by large, high capacity transportation investments. The toolkit helps regional partners understand the impacts of existing and proposed transportation investments. This includes economic development impacts (e.g., changes in income, gross regional product, employment), land value effects (e.g., changes in property values and housing costs), and societal benefits (including reduction in personal travel delay, safety, and emissions benefits). The resulting product will analyze effects at the megaregion and sub-region levels.