This report reviews and summarizes the findings of previously published studies on the impacts of the Appalachian Development Highway System (ADHS) on economic growth and transportation connectivity in Appalachia. The collective findings of these reports cover a wide range of topics, including research on the role of the ADHS in regional economic growth and development; case studies of impacts associated with specific ADHS corridor projects and their connection to multi-modal transportation facilities; and emerging issues concerning the role of the ADHS network in enabling national highway connectivity and an emerging intermodal freight system.

This is the first volume in an ongoing study that more broadly analyzes the ways that ADHS development
has affected economic growth in Appalachia, and the future economic benefits and costs of completing
the ADHS.