Map of the Appalachian Development Highway System as of September 30, 2016. As the original map is labeled "Source: Appalachian Regional Commission", and the ARC is an agency of the U.S. Federal Government, this is public domain.
United States Federal Government
<a rel="nofollow" class="external free" href="https://www.arc.gov/adhs">https://www.arc.gov/adhs</a>