Indiana Department of Transportation:Official website.
86 64.org: Private organization proposing to move Interstate 64 traffic into the state away from downtown Louisville, Kentucky.
Arenn's Transportation Pages: Opinions on Indianapolis and Chicago highways. Also much objective Indianapolis information.
Darren's Louisville Transportation Page: Predominantly about roads in the metro area in Kentucky and Indiana.
Great Lakes Circle Tour: Covers the signed tours around the lakes.
Indiana Toll Road Concession Company: Official site. Includes toll rates, maps, and news.
Major Moves: Website opposing the 2005 Department of Transportation ten year plan with the same name, with special focus on the Indiana Toll Road lease plan.
Michiana Roads: Information and photos covering Southwestern Michigan and North-Central Indiana (Greater South Bend).
The David Letterman Expressway: Page citing references to this non-existent designation along Interstate 465 in the Indianapolis area.
U.S. 31 Coalition, Inc.: Promotes the upgrade of this highway between Indianapolis and South Bend.