Last year I was at the front of a 3 car accident. Sitting at a stop, blinker on to make a left turn, guy behind me gets plowed into, subsequently hits me.

Had I had a rear-facing dashcam, the SECOND car would likely have been put partially as fault as well. He was tailgating me for miles before-hand, tried passing me on a double-yellow less than a mile before the accident, and was right up on my bumper when he hit me. Had he given proper spacing between stopped vehicles, I very likely would not have been hit at all.

I got lucky with that accident, my damage was all cosmetic while the other two cars were totalled.