| Columbia River Highway | | Scans of photos from a book and transcriptions of their captions of this highway in northern Oregon. |
| Dixie Highway | | Guide to this eastern U.S. highway system of the early 1900s. |
| Drive the Old Spanish Trail | | Contains history about and photographs of the former auto trail running along the southern tier of the U.S. |
| Goodbye, Old Friend | | Includes some historic photographs and details about U.S. Highway 27's former routing in Michigan, now supplanted in the state primarily by US-127 and Interstate 69. |
| Highway History | | 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. |
| Historic Columbia River Highway | | 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. |
| North American Auto Trails | | Catalog of auto trails from the United States and Canada in the 1910s and 1920s; includes route markers and current numbers. |
| Old Spanish Trail Centennial | | Organization involved in preparing the 2029 celebration of the auto trail. Includes history and travel log scans of the route. |
| Pete's Road Page | | Contains articles on Northwest Indiana, U.S., roads such as the Dunes Highway, the Chicago-Detroit Post Road, and the Lincoln Highway. Includes maps. |
| Route 40 - National Road | | Guide to the first federally-funded road in the U.S. (1800s) and the route which followed it later (US 40). | |
|