This morning myself and a handful of other bikers got a warning from the Golden Gate Police - basically cyclists (the locals not the rentals) have injured too many people so effective immediately they will strictly enforce the traffic rules. In other words, they are going to hide by the stop signs and issue tickets for even slow roll stops. Even though I stopped completely, I was detained and got to hear it anyway. It was an interesting way to kill 10 minutes. Sounds like they may be looking for a revenue source.