Transportation Sites
- Other State DOTs
- United States DOT
- Federal Aviation Administration
- Federal Highway Administration
- Federal Railroad Administration
- Federal Transit Administration

- Detroit/Windsor Tunnel
- Highway Traffic Safety Administration
- Office of Highway Safety Planning (OHSP)

Safety
- USDOT Auto Safety Hotline
- Operation Lifesaver Rail Crossing Safety

More Michigan Sites
- American Council of Engineering Companies
- Asphalt Pavement Association of Michigan
- County Road Association of Michigan
- Detroit Wayne County Port Authority
- Michigan Aggregate Association
- Michigan Concrete Association
- Michigan Environmental Council
- Michigan Highways
- Michigan Infrastructure & Transportation Association
- Michigan Road Preservation Association
- Michigan Townships Association
- NW MI Council of Governments
- Public Transit Agencies
- Road Commission for Oakland County
- Southeast Michigan Council of Governments
- W. MI Shoreline Regional Dev. Commission

Scenic Highways
- National Scenic Byways Online