United States

AARoads Roadtrips
Contains photographic logs of various routes in the East-Central region.
http://www.aaroadtrips.com/

Adopt A Highway Maintenance Corporation
Provides for sponsorship in various states.
http://www.adoptahighway.com/

American Association of State Highway and Transportation Officials
Much information on this consortium.
http://www.transportation.org/

American Byways
Covers Kentucky, Ohio Tennessee, Virginia, and West Virginia and surrounding areas. Photography, historical information, and forum.
http://www.americanbyways.com/

American Highway Users Alliance
Interest group representing motor vehicle users and businesses promoting highway safety and efficiency. News updates and Rules of the Road publication information.
http://www.highways.org/

American Society of Highway Engineers
Newsletters, FAQ, and other features relevant to the trade.
http://www.highwayengineers.org/

Appalachian Regional Commission Development Corridors
Unofficial site which explains these potential thoroughfares.
http://www.aaroads.com/arc/

Bygone Byways
Descriptions of current and former US routes 66, 80, 99, and 101 as well as other notes.
http://www.bygonebyways.com/

CatSynth.com - Highways
Contains commentary and information about various routes across the country.
http://www.ptank.com/catsynth/static.php?page=highways

Coast to Coast on US 50
History and other information.
http://www.route50.com/

Corporate Sponsor Adopt A Highway Program
Lists the steps which may be taken for Adopt-A-Highway Litter Removal Service of America, Incorporated to manage the section which is requested. Includes option to receive visual impressions.
http://www.adoptahighway.net/

3-digit Interstate Highways
Location, history, and trivia. Includes ones that were proposed but never built.
http://www.kurumi.com/roads/3di/

3dis that Aren't--State Route Spurs and Loops
Information about state routes that could be an interstate of the same number.
http://members.tripod.com/~chris295/

Expressways Online
Commentary and articles about relevant issues, authored by a former editor of Roads and Bridges magazine.
http://www.expresswaysonline.com/

Gorp's Top Ten US Scenic Drives
List which includes details on the Blue Ridge Parkway, Seward Highway, California 1, Vermont 100, and the Custer Scenic Byway.
http://gorp.away.com/gorp/activity/byway/topten.htm

Green Highways Partnership
Multi-sector initiative that seeks to incorporate environmental sustainability into all surface transportation infrastructure. FAQs, media resources, and contact information.
http://www.greenhighways.org/

Heartland Expressway
A proposed divided highway running between Rapid City, South Dakota and Denver, Colorado, also known as High Priority Corridor 14 of the Intermodal Surface Transportation Efficiency Act of 1991. Maps, project status, and various other facts.
http://www.heartlandexpressway.com/

High Priority Corridors
Information about these highways which have been set aside as most important in the 1998 bill "Transportation Equity Act for the 21st Century (TEA-21)".
http://www.aaroads.com/high-priority/

Highway Deficiencies
A compendium of substandard features.
http://www.ajfroggie.com/roads/deficiency/

Highway History
Federal Highway Administration page with a collection of articles including those on U.S. Highway numbering and creation of the Interstate system.
http://www.fhwa.dot.gov/infrastructure/history.htm

Highways and Gas Stations
Includes information on various highways in Minnesota, Missouri, Ohio, and Pennsylvania.
http://www.geocities.com/pennsylvaniatpk7689/

Highways.TV
Links to state transportation resources throughout the country including weather, cams, reports, and hotel reservations.
http://www.highways.tv/

The Interstate is 50
American Association of State Highway and Transportation Officials page commemorating the 50th anniversary of the Interstate System in 2006. Includes history and photographs.
http://www.interstate50th.org/

Interstate-Guide.com
Includes the Interstate Guide, the List of Interstate Business Routes, and the Interstate Shield Gallery. Includes coverage.
http://www.interstate-guide.com/

Kim Russell's U.S. Highways Page
Gives brief descriptions of all U.S.-numbered routes, past and present, as well as suggestions for possible future routings.
http://www.geocities.com/kimrussell72/

Larry's Phat Page - Highways
Route logs of and personal travel comments about various highways, primarily Interstates.
http://www.phatpage.org/highways.html

Michelle Skinner's Interstate Page
Gives descriptions of each route.
http://www.geocities.com/michelleskinnerfreeway/

Midwestroads.com
Covers the respective region of the country. Includes historic maps, planning documents and reports, and photos.
http://www.midwestroads.com/

MotorcycleRoads.US
Compilation of lists specifically for motorcyclists who prefer scenic or winding routes.
http://www.motorcycleroads.us/

Multiplex Index
Gallery of shields along roads with more than one route number.
http://www.m-plex.com/roads/mpindex.html

National Cooperative Highway Research Program
Details on this division of the Transportation Research Board, a unit of the National Research Council.
http://www.trb.org/CRP/NCHRP/NCHRP.asp

Ports-to-Plains Trade Corridor
Coalition to improve north-south transport in the West-Central part of the country. Maps, construction information, and contact information.
http://www.portstoplains.com/

Redhighways.com
Text guides to various U.S. Highways, with links.
http://www.redhighways.com/

Road Geek Stuff
Includes various topics.
http://www.mylandofmisery.com/roads.htm

The Road Information Program
Nonprofit organization promoting policies which are designed to improve traffic conditions.
http://www.tripnet.org/

Road Stuff
Much Northeast coverage. Also includes photos, map scans, and a log of Route 9's in the country.
http://neilbert.com/blog/

Road Trip USA
Great detail on various at-grade long-distance routes.
http://www.roadtripusa.com/

Roads, Highways and Trails
Detailed personal travelogue.
http://rachela.tripod.com/roads/roads.html

Roadsidephotos.sabr.org
Contains information about certain highways culled from cross-country trips. Includes maps.
http://roadsidephotos.sabr.org/

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/

SmarTraveler
Traffic reports for cities and other travel information.
http://www.smartraveler.com/

Southern Highroads Trail
A designated scenic highway going through Georgia, Tennessee, North Carolina and South Carolina. Official tourism site.
http://southernhighroads.org/

Southern Highways
Various scenes from along the southern tier of the country.
http://www.angelfire.com/ms3/corridorx/

Summer of 6
Weblog of a 2006 trip documenting U.S. 6 in comments and photographs.
http://www.floodgap.com/roadgap/6/

Traffic Counts
List of Average Daily Traffic (ADT) tallies for major metropolitan areas.
http://www.webspawner.com/users/beachbuminda650/

United States Code Title 23 - Highways
Complete contents of the document.
http://www.access.gpo.gov/uscode/title23/title23.html

U.S. Code of Federal Regulations Title 23 - Highways
Complete contents of the 2005 revision.
http://www.access.gpo.gov/cgi-bin/cfrassemble.cgi?title=200523

US Highway 101: Guide to the Pacific Coast Highway
Covers many aspects.
http://www.us-101.com/

US Highways: From US 1 to US 830
Complete list including historic, plus other features.
http://www.us-highways.com/

U.S. Hwy. 90 - The Southern Route 66
Travelogue and old postcard scans. Page linked is Louisiana but there are also pages on Texas, Mississippi, Alabama, and Florida.
http://ucmmuseum.com/hwy90la.htm

US Route 20
Information and some history.
http://www.usroute20.com/

U.S. Route 6 Tourist Association
Covers the entirety of the route. Page includes background, news articles, and maps.
http://www.route6tour.com/

USroadman.com
Log of travels along U.S.-numbered routes. Includes route histories and links to photographs.
http://home.att.net/~usroadman2/

The ZZYZX Interstate Highway List
Gives an overview of the system and provides a listing of all one- and two-digit routes.
http://www.ihoz.com/interstates.html