I was wondering about this last week. I saw people gesturing to a motorcycle cop as I drove south by the left hand turn lane. He was behind me and all I saw were people in their cars waving frantically to me, or so I thought, lol. I was starting to wonder if I was one of those people who hits a pedestrian and has no idea until they see blood on the front of their car, cuz it seemed like they were trying hard to get my attention. I was about to freak out until the cop zoomed in front of me and went back there. I figured either someone had a heart attack in their car when turning left, or the light wasn't working. Good to know it was the latter.