(Kinda relevant photo, but it's a girl on a bike. Spotted via FY,G+B)
After the cyclist who was hit and killed after making the illegal left, and the woman who was struck by a cyclist and died, SFPD has picked up word about their relax enforcement. They set up a station on 5th and Market last week flagging down any and all cyclist who are breaking a law.
I was told by a cop that on an intersection near Divisadero and Oak, 3 cyclist were hit last week and enforcement is going up in general. Be careful out there.