The cable cars are purely a tourist attraction. Waiting times can exceed an hour, so nobody uses them to commute. The rest of SF Muni is a joke. Average fleet speed is 8mph and has been declining. On one Sunday workout, I outran an express line from its start to finish. Anyone on a bicycle can beat Muni in price, speed, and convenience. The situation would be comical if it didn't cost taxpayers $800 million per year.