I'm a Brit living in Chicago and have been bike commuting for about a month now. I can report that pretty much everyone runs reds. I often get left behind at the lights by sweet old ladies on folding shoppers as they jump lights. Mostly this is safe stuff - no traffic on the junction, etc. None the less, I was shocked by the extent of it. Incidently, why doesn't the US use roundabouts instead of millions of lights and all-way stop junctions? These are so disruptive to traffic flow, poor for pollution, etc. While European roundabouts are not perfect, they are a lot better than all-way stops and poorly configured lights.