I've been using a helmet mounted mirror for four years now and it really helps. I can spot a car from a great distance and then use the "look back" method as well as waving them around long before they get close. It functions more as a clear signal of you knowing they are there and I think that helps prevent honking and "sneak passing".
What would be really good would be clear public knowledge of the possibility that "those front and back flashing lights" were also auto-radar triggered cameras. Anyone from Cateye out there listening in?
