wheelchair lifts since 1997 for accessibility. Bike racks were installed on buses beginning in 1999 as part of the Bike Racks on Buses program. Current fleet The active fleet consists of 147 buses owned by Golden Gate Transit. GGT also operates buses owned by Marin Transit, as described here. Historical fleet Fares Golden Gate Transit charges different fares, depending on distance (zones) traveled and method of payment. Fares can be paid with cash or Clipper card. As of July 1, 2021, adult cash fares are as follows: Adult Clipper fares are discounted 20% for most trips, except within Zones 2, 3, and 4 where the discount is 10% to match Marin Transit fares. A 50% discount is provided to youth (ages 5 through 18), senior (ages 65 and over), disabled (), Medicare passengers, and passengers with a Clipper START card. In addition, as a result of a bus service contract with BART, Clipper fares for travel within Zone 7 and between Zones 1 and 7 are further reduced. Transfers are issued by the farebox upon request at the time of cash fare payment. Clipper automatically tracks transfers. Transfers are valid for two hours for intra-county travel and three hours for inter-county travel and can be used twice. Round-trips are not permitted for inter-county travel. Full transfer privileges are available to/from Marin Transit. Transfers are issued from GGT to Golden Gate Ferry for cash and Clipper customers, but transfers from Golden Gate Ferry to GGT are available only to Clipper customers. Transfers are available to/from some other connecting transit systems, including AC Transit, Muni, Petaluma Transit, Santa Rosa CityBus, SMART, SolTrans, Sonoma County Transit, and WestCAT. Muni transfers are available only to Clipper customers. Golden Gate Transit accepts one-day and 31-day passes issued by Marin Transit for rides within Marin County. No other pass products are accepted. Club Bus program The Club Bus program was administered by Golden Gate Transit through 2012. It provided commuter clubs with contract support for subscription bus service on routes not otherwise operated. The program also provided a 30% subsidy for the cost of service. The program required the formation of not-for-profit organizations to collect riders' subscription fees and develop schedules. The Marin Commute Club, which began service in 1971, had direct service from Marin County to three University of California, San Francisco locations (Parnassus Campus, Mission Bay Campus, San Francisco General Hospital) not otherwise served