1999 Road to Ruin Report Written by Friends of the Earth and Taxpayers for Common Sense, this lists what they think are the 50 most wasteful road projects in America.
Highway History Federal Highway Administration page with a collection of articles including those on U.S. Highway numbering and creation of the Interstate system.
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).
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)".
Bygone Byways Descriptions of current and former US routes 66, 80, 99, and 101 as well as other notes.
3-digit Interstate Highways Location, history, and trivia. Includes ones that were proposed but never built.
Road Trip USA Great detail on various at-grade long-distance routes.
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.
SmarTraveler Traffic reports for cities and other travel information.
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.
Interstate-Guide.com Includes the Interstate Guide, the List of Interstate Business Routes, and the Interstate Shield Gallery. Extensive coverage.
Traffic Counts List of Average Daily Traffic (ADT) tallies for major metropolitan areas.
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. Site includes maps, project status, and various other facts.
American Highway Users Alliance Interest group representing motor vehicle users and businesses promoting highway safety and efficiency. Site includes news updates and Rules of the Road publication information.
Places 2 Drive Guide to scenic drives, roadside attractions, automotive events and car accessories, with public submissions.
American Byways Covers Kentucky, Ohio Tennessee, Virginia, and West Virginia and surrounding areas. Site includes photography, historical information, and forum.
Highways and Gas Stations Includes information on various highways in Minnesota, Missouri, Ohio, and Pennsylvania.
USroadman.com Log of travels along U.S.-numbered routes. Includes route histories and links to photographs.
Expressways Online Commentary and articles about relevant issues, authored by a former editor of Roads and Bridges magazine.
Ports-to-Plains Trade Corridor Coalition to improve north-south transport in the West-Central part of the country. Site includes maps, construction information, and contact information.
Roadsidephotos.sabr.org Contains information about certain highways culled from cross-country trips. Includes maps.
New England Turnpikes Information, exit lists, and photos of the modern-day turnpikes.
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.
Summer of 6 Weblog of a 2006 trip documenting U.S. 6 in comments and photographs.
