The PresidiGo Shuttle Service now operates on weekends absolutely for free. All the visitors & local residents are more than welcome to avail this free service without any travel pass on weekends. The express route shuttle starts at 10am from its origin the Presidio Transit Center (Main Post) & stops at the Letterman District - Union St or Van Nes Avenue - Embarcadero BART & the Transbay Terminal and continues the service till 7:30pm. Presidio with its historic buildings, beautiful grounds & iconic location invites you to enjoy its beauty and engage in its preservation to contribute its influence in shaping American History.