Historic

Traveling the Dixie Highway in Michigan - Photographs with descriptions from the eastern branch of the highway.
http://www.rreini.com/dixiehwy-mi/dixiehwy-mich.htm

Old Trails - US and Canadian Roads in the 20th Century - Contains various graphics and photographs of examples from the time period such as map covers, postcards, and signs.
http://www.rreid.net/OldTrails/

Columbia River Highway - Scans of photos from a book and transcriptions of their captions of this highway in northern Oregon.
http://mryamamoto.50megs.com/columbia/columbia.htm

El Camino Real International Heritage Center - 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.
http://www.elcaminoreal.org/

White Pole Road Development Corporation - Includes history of this Iowa, U.S., auto trail.
http://www.whitepoleroad.com/

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).
http://www.route40.net/

On the Trail of the Named Highways from Chicago to the Southwest - Gives descriptions of these auto trails with specific mention of the Pontiac Trail.
http://windycityroadwarrior.com/Stories/Pontiac_Trail.html

National Road Association of Illinois - 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.
http://www.nationalroad.org/

Indiana's Historic National Road - Covers that state's portion of the road from Illinois to Maryland, U.S. Includes history and attraction listing.
http://www.indiananationalroad.org/

Drive the Old Spanish Trail - Contains history about and photographs of the former auto trail running along the southern tier of the U.S.
http://www.drivetheost.com/

Roadsidephotos.sabr.org - Contains information about U.S. 66 and the Lincoln Highway, including maps.
http://roadsidephotos.sabr.org/

The Dixie Highway of North Georgia - Tourism project for Cobb, Bartow, Gordon, Whitfield and Catoosa Counties in the U.S. state. Features history and maps.
http://www.dixiehighway.org/

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.
http://www.columbiariverhighway.com/

A Few Ghostation and Ghostroad Pix - Description and photos of former US 80 through California and Arizona including the old plank road.
http://personal.riverusers.com/~fw/ghostroads/ghostroads.htm

US-27 in Michigan - Includes some historic photographs and details about this route's former routing in the state, now supplanted primarily by US-127 and Interstate 69.
http://www.cqql.net/us-27.htm

Historic Auto Trails of Massachusetts - History and photographs from the ones in the western part of the state and nearby areas.
http://www.muddyriverpress.com/historicauto.html

New England Interstate Highways of the 1920s - Route log of the system that predated the U.S. highway system.
http://www.roadgeek.org/nehwys/

Dixie Highway - Guide to this eastern U.S. highway system of the early 1900s.
http://www.us-highways.com/dixiehwy.htm

Travel on the Old National Road - Activity page containing articles and links regarding this U.S. road, now mostly US 40. Part of an educational website about Abraham Lincoln.
http://www.alincolnlearning.us/NationalTrailActivity.html

Travel the Bozeman Trail - A gold-rush trail cutting through the hunting grounds of the Northern Plains Indians in Montana and Wyoming, U.S.
http://www.bozemantrail.org/

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.
http://members.tripod.com/~Ogden_Dunes/roads/

Via Egnatia - Ancient Roman Road through the Balkan Peninsula of Europe. Includes map, links, and news.
http://www.viaegnatia.net/

Old Spanish Trail Centennial - Organization involved in preparing the 2029 celebration of the auto trail. Includes history and travel log scans of the route.
http://www.oldspanishtrailcentennial.com/

Great Platte River Road Archway Monument - Structure built over I-80 in Nebraska, U.S., commemorating the old wagon trail. Virtual tour included.
http://www.archway.org/

The Yellowstone Trail - Guide to the old highway along the northern tier of the United States.
http://www.yellowstonetrail.org/

Interregional Highways - Early plans for systems in the United States, some implemented, some not.
http://www.roadfan.com/intreg.html

Oregon Trail: The Trail West - Detailed information about trail from Oregon to Missouri.
http://www.vlib.us/old_west/trails/othist.html