Originally Posted by Jay Turberville

The studies I've seen suggest that traffic violations are about equal between cars and bicycles.

My observation is that cars and bicycles will both routinely roll stops when
1) it is obvious and clear that there is no cross traffic
2) they are not intersecting a faster and more major thoroughfare.

Someday I'll put a video camera up at a typical local stop and gather some stats on it. My bet is that 2/3rds of the drivers will roll the stop when they are alone.

I think it is actually safer and more expeditions for cyclists to treat stop signs as yield signs. That helps them clear the intersection quickly and is still quite safe. Some cities (apparently yours) have realized this and have changed regulations accordingly.