Interest group representing motor vehicle users and businesses promoting highway safety and efficiency. News updates and Rules of the Road publication information.

Links to state transportation resources throughout the country including weather, cams, reports, and hotel reservations.

Coalition to improve north-south transport in the West-Central part of the country. Maps, construction information, and contact information.

Covers the entirety of the route. Page includes background, news articles, and maps.

Great detail on various at-grade long-distance routes.

Includes the Interstate Guide, the List of Interstate Business Routes, and the Interstate Shield Gallery. Includes coverage.

American Association of State Highway and Transportation Officials page commemorating the 50th anniversary of the Interstate System in 2006. Includes history and photographs.

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.

Provides for sponsorship in various states.

Location, history, and trivia. Includes ones that were proposed but never built.