Actually these Uber Volvo self driving cars have been picking up passengers using UberX in San Francisco for weeks. They're easy to spot because they have a huge lidar contraption on the roof and a lot of camera's mounted on the roof, rear vision mirrors, and the rear tailgate of the vehicle. The depot they use is on Harrison and 3rd so you see a lot of them driving around the area just south of Market Street, which has a lot of traffic obstacles, construction, and pedestrians. They go very slow and stop often out of an abundance of caution, much to the consternation of impatient SF drivers behind them.