For me personally, riding through intersections at green light is most dangerous, that's why I prefer to run through reds if an oppurtinity to so is there. Another danger is getting rear ended, when taking a lane on some of the busy major roads.... Around here nobody ever takes a lane, instead you ride as far right as possible and deal with close passes. If you do take a lane in my city, your remains will be splatered all over the road and you won't be typing on bikeforums about your VC cycling exploits. A couple of cyclists around my area have also died from right hooks,