Agree with some of the above, but the only thing I don't disregard are cars, trucks and motorcycles. Otherwise, I cross where I want (middle of the street if it's safe, ride on the sidewalks even if there are bike lanes and whatever else). Traffic signals, signs etc, can't hurt me, fast moving vehicles can. All that said, I behave if there are others (including the constabulary) around, and don't do anything to piss off drivers.