Tracy is the second most populated city in San Joaquin County, California, United States. The population was 82,922 at the 2010 census. Tracy is located inside a geographical triangle formed by Interstate 205 on the north side of the city, Interstate 5 to the east, and Interstate 580 to the southwest, this has given rise to Tracy’s motto, now recorded on the city’s website: “Think Inside the Triangle”.

Tracy is served by several bus services, locally Tracer runs four lines that serve as circulators between major transit hubs, shopping, school, residential and downtown areas. San Joaquin Regional Transit District (SMART) runs two local routes that connect the city with other San Joaquin County communities and six commuter services that run to Dublin/Pleasanton BART station and job centers in the South Bay and Livermore. Naglee Park and Ride Lot by the West Valley Mall serves as a major commuter hub to BART and jobs in the South Bay. Greyhound, Tracer, and SMART all connect with taxis, bike stations, and parking at the Tracy Transit Center, a transit station built in 2010.

Amtrak Buses connect serve the city’s Amtrak Bus Station with six daily trips to the South Bay and two to San Francisco, all of which stop at BART and job centers in Livermore.

To meet the future transportation needs which will connect San Joaquin Valley with the Bay Area, there are two Transit Stations in Tracy. One is located downtown and is currently designated for bus service, but is being considered as a possible location for California High-Speed Rail.

South Tracy offers the Altamont Commuter Express (ACE) service at Tracy (ACE station), which provides commuter rail transportation to the Bay Area and connects with VTA in San Jose, BART via shuttle in Dublin and Fremont, in addition to Amtrak train in Santa Clara and San Jose.