TDOT: State Route 840 South
- Purpose, history, and status of this project that is building a ring highway around the Nashville area. With maps and photos.
- http://www.tdot.state.tn.us/sr840s/

TMA Group Smart Travel Information
- Resources for commuters and visitors to Williamson County and Franklin. Includes vanpools, telework and transit options, an on-line rideshare form, cost of commute calculator, driving directions, and news about road closures and construction.
- http://tmagroup.org

Nashville Area Metropolitan Planning Organization
- Five-county, 19-member organization responsible for long range transportation planning in Middle Tennessee. Member jurisdictions are in Davidson, Rutherford, Sumner, Williamson, and Wilson counties.
- http://www.nashvillempo.org/

Regional Transportation Authority
- Nine-county regional agency that plans and develops regional transit in the Nashville area. Site includes information on ride-sharing, HOV lanes, regional buses, and longer-term initiatives such as commuter rail.
- http://www.rta-ride.org/