However, the subway (BART) and commuter rail (Caltrain) systems do have fare zones. In both cases, you_ll have a fare chart posted near the automated ticket machines in every station. You_ll need to know where you_re going to tell the machine to print out the correct amount. The machines - unlike the drivers - are programmed to provide change.
Don_t sit in back of the bus. Tell the driver where you are going so he/she can call out the stop or tell you where to get off. I find other passengers really friendly and helpful, too.