Riding to work today, I saw a guy turn left at an intersection as soon as the light changed to green. Meaning, as soon as it turned green, the guy turned left before the on coming cars, on the opposite side of traffic, even made it in the intersection. In a way, it could be considered "cutting them off", but really the oncoming traffic wasn't effected because of the bikes acceleration. So while it seems like a good way to get T-boned on a bike, is it in fact illegal? Opinions? Facts?