Only ever had class bravo clearance once through SFO. 28L/R active for arrivals and 01L/R for departures. On the return leg south we passed over the extended centreline for 28L/R at 2000ft and was asked to make a right turn to get clear of this line. Plus we were asked to keep highway 101 off to our left (you can hear the atc comms 0:30secs into the video).
YouTube - C172 San Francisco Bay Tour