Tracer is the public bus system for the city of Tracy, California. Unique among tansit agencies, since 2002 the service operates as free public transport every April and December.
The service provides six circulator routes. The buses are designated by letters A through E. Fares range from free to 1.50 depending on the category. Most routes operate from approximately 7 AM to 7 PM weekdays and 9 AM to 5 PM on hourly headways. Service is provided near Tracy ACE station and to West Valley Mall. Major hubs for this bus system are Tracy Transit Center with connections to San Joaquin Regional Transit District (SMART) bus lines to neighboring communities in addition to Greyhound Lines and Amtrak Thruway Bus services. The service's second hub is at Naglee Park and Ride Lot by West Valley Mall where numerous SMART lines connect to the Dublin/Pleasanton BART station and job centers in Livermore, Palo Alto, Mountain View, Sunnyvale, Santa Clara, Pleasanton, Milpitas, and San Jose. The Tracer line A connects with the Amtrak Thruway Bus at the Tracy Amtrak Bus Stop at Clover Road near I-205 and Tracy Boulevard. Line 6 runs six daily trips in either direction between and San Jose, California while line 34 twice daily trips to San Francisco.San Joaquin RTD operates commuter service between Stockton and Dublin/Pleasanton BART station via Tracy on like 150 which also has a spur line between Tracy and Manteca.