This is my truck. I have people pull out in front of me on a daily basis. I have no idea how they could possibly miss the BIG FRIKIN WHITE TRUCK, but they do. We've come to the conclusion that the truck is cloaked and they really can't see it.
What's the point? Just this. People in general pay little to no attention when they drive. The color of your helmet isn't going to help if they are not looking at you. So get what ever color you want and wear the darn thing everytime you ride. It just may save your life some day.