I cycle a lot, and I don't drive. And yes, I sometimes break rules for my safety. For example, I refuse to use stupidly designed cycle lanes that:

* Mount the foot path and then return to the road.

* Force me to use pedestrian crossings at roundabouts.

* Railroad me onto the side of the road when I actually want to make a turn (ie: force me to dismount and use a pedestrian crossing instead of using the correct lane for that turn)

* Vanish abruptly

But a lot of cyclists I see (in my city anyway) are just inconsiderate assholes who have no road etiquette. They run red lights, ignore one way systems, cycle on pedestrian paths, or (the very worst) cycle the wrong way on cycle paths.

And don't get me started on lycra clad (always male) cyclists who 'come at you' side-by-side on a cycle path that fits exactly two cyclists. I'm not sure if they expect you to slide into another dimension, but a loud, sharp c-word generally jolts them out of their idiocy.