Here in philadelphia, I run red lights, stop signs, I "push the green" (stopping at a red light, but then going before it turns green), ride going the wrong way (not very often, i dislike that alot) among other things. Tons of other bicyclists do it too. So do motorists. I know I'm taking a risk but I look before I go always. Cops never have said anything to me. A friend of mine once got pulled over because he pushed off a cop car in traffic to steady himself.....
I've reported poor road conditions to cops and they didn't care or call it in. Like recently when I hit spilled oil on a major street that i take to work daily and slid 10 feet...
I should mention that If i feel like something is not safe, then I will not do it, for example, if I can't see cars coming out of an alley, then I do not just blow past it willy-nilly, I check before I ride past. One time I was going the wrong way on a sidewalk and went through a red light and was tapped by a PT Cruiser.
whoops. I now avoid that situation everytime.
-Brent