Michigan State Highways
- Details on all of the state trunklines and their history, plus other highway facts.
- http://www.michiganhighways.org/
US-12 Heritage Trail - Page describing the Historic Heritage Route. Includes tour detail files, history, FAQ, newsletter, and links. - http://www.us12heritagetrail.org/
Detroit Highways - Contains route logs, historical information, and personal observations. - http://people.ku.edu/~afarina/recreation/highways/
County Road Association of Michigan - Organization representing the interests of the state's county road agencies. Site includes information on each agency. - http://www.micountyroads.org/
MPG Roads - Various topics on the state as well as Georgia and Pennsylvania. - http://www.gribblenation.net/mpg/
Michiana Roads - Information and photos covering Southwestern Michigan and North-Central Indiana (Greater South Bend). - http://www.roadfan.com/michroad.html
Great Lakes Circle Tour - Covers the signed tours around the lakes. - http://www.great-lakes.net/tourism/circletour/