Realize that to on-coming and turning traffic, you are a single point of reference for their depth perception, and they cannot easily judge your speed (if they actually SEE you). This is really important if you like to push the speed limit. For example, if you're doing 75mph in a 45mph zone, you will arrive at the scene of the accident 67% faster than the left-turning driver expects you. I saw the aftermath of a left-turning car/MC accident on TV last week where a young guy and his girlfriend on the MC were injured. The cage driver said yes he saw the bike, but thought he had plenty of time to make the turn.