Originally Posted by
Chinghis
If nothing else, my helmet is for another layer of visibility. One of those bright chartreuse Garneau things that Performance sells. I find on my commute that when cars are coming out of driveways or their vision of me is somehow blocked, I can stand on the pedals and let them see the helmet coming. It seems to work (along with eye contact).
An appropriately colored baseball-type cap also serves that purpose and has the advantage of being lighter, more comfortable, better ventilation, is cheaper and keeps the rain and sun out of the cyclist's eyes.