- United States Federal Highway Administration page with a collection of various auto trail, U.S. highway, and Interstates histories, some from older FHWA publications, as well as other related information.
- Includes information about the El Camino Real de Tierra Adentro National Historic Trail, which traverses the country of Mexico and the U.S. state of New Mexico.
- Site covering the routing in Oregon, U.S. along the river in the general location of modern US 30 and Interstate 84. Includes activity information, pictures, postcards and ephemera scans.
- Organization focused on promoting the history of the first byway going west across America, currently known as U.S. Route 40. Includes history of the road, stories, membership details, and contacts.
- Contains articles on Northwest Indiana, U.S., roads such as the Dunes Highway, the Chicago-Detroit Post Road, and the Lincoln Highway. Includes maps.