About U.S. Highways and Interstate Freeways

Highway Numbers

http://www.ccrc.wustl.edu/~ipgs/transport/road/na/na/html

Interstate Numbers

http://www.ihoz.com/basic.html

U.S. Byways

http://byways.org

U.S. Interstates

http://www.ihoz.com/ilist

U.S. States and Capitals

http://www.50States.com

See Also:
Transportation Systems Management