There are a few twitter accounts I follow who post some egregious infractions throughout SF. There have been some wins [1], but unfortunately I see the same types of violations by commercial vehicles posted over and over again and I think those drivers just don't care (and as far as I can tell they face little to no enforcement).<p>And for those on the high horse about cyclists breaking laws, just remember that nearly 100% of drivers break the law every time they drive --- speeding. Drivers think that going 30mph in a 25mph zone or 40mph in a 35mph zone isn't a big deal, but those small differences in speed mean a lot to people outside of vehicles if they get hit [2].<p>Also I haven't seen any data that shows that the most common cyclist infraction that everybody complains about, yielding at stop signs, actually is more dangerous. Yet it is very easy to show that speeding by vehicles is incredibly dangerous and costs many lives every year.<p>1: <a href="http://www.sfexaminer.com/uber-drivers-sf-receive-cyclist-safety-training/" rel="nofollow">http://www.sfexaminer.com/uber-drivers-sf-receive-cyclist-sa...</a><p>2: <a href="http://nacto.org/docs/usdg/relationship_between_speed_risk_fatal_injury_pedestrians_and_car_occupants_richards.pdf" rel="nofollow">http://nacto.org/docs/usdg/relationship_between_speed_risk_f...</a>