Exploring Indiana's Highways
- Includes in-depth reports of various examples in the southern part of the state, focusing on former alignments.
- http://www.jimgrey.net/Roads/

Illiana Expressway?
- Weblog about the proposed facility south of Chicago.
- http://christopherhedges.com/noilliana/

Indiana Toll Road Concession Company
- Official site. Includes toll rates, maps, and news.
- http://www.indianatollroad.org/

The David Letterman Expressway
- Page citing references to this non-existent designation along Interstate 465 in the Indianapolis area.
- http://home.insightbb.com/~neilrapp/dlx/

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.
- http://www.majormoves.org/

86 64.org
- Private organization proposing to move Interstate 64 traffic into the state away from downtown Louisville, Kentucky.
- http://www.8664.org/

Michiana Roads
- Information and photos covering Southwestern Michigan and North-Central Indiana (Greater South Bend).
- http://www.roadfan.com/michroad.html

Arenn's Transportation Pages
- Opinions on Indianapolis and Chicago highways. Also much objective Indianapolis information.
- http://www.urbanophile.com/arenn/trans/trans.html

Great Lakes Circle Tour
- Covers the signed tours around the lakes.
- http://www.great-lakes.net/tourism/circletour/

Darren's Louisville Transportation Page
- Predominantly about roads in the metro area in Kentucky and Indiana.
- http://transport.webonastick.com/louisville/

U.S. 31 Coalition, Inc.
- Promotes the upgrade of this highway between Indianapolis and South Bend.
- http://www.us31coalition.com/