SAN DIEGO (FOX 5/KUSI) -- Wednesday, Oct. 2 marks the return of "Free Ride Day," according to the San Diego Metropolitan Transit System. All MTS trolleys and buses, as well as the NCTD COASTER, SPRINTER and BREEZE, will be free to ride all day. No PRONTO card is needed for this deal. There will also be "pop-ups" at certain transit centers around the region offering giveaways and refreshments: Here's a list of those locations and times: San Ysidro Transit Center700 East San Ysidro Blvd.5 a.m. to 7 a.m. Old Town Transit Center4009 Taylor St.6 a.m. to 8 a.m. Fashion Valley Transit Center1205 Fashion Valley Rd.6 a.m. to 8 a.m. E Street Trolley Station750 E St.4 p.m. to 6 p.m. Euclid Avenue Trolley Station450 Euclid Ave.4 p.m. to 6 p.m. "Free Ride Day' is held in conjunction with California Clean Air Day, a time for residents across the state to take steps to reduce their carbon emissions. The free rides couldn’t come at a better time, especially for Padre fans as nearly 7,000 are expected to take public transit to get to Wednesday night's game. More than 250,000 transit trips are expected to be taken on "Free Ride Day."