Originally Posted by NEVERLOST
white helmets are more visable
My understanding is that this idea, which has a lot of currency on the internet, is based on a New Zealand study. One of the authors of the study delivered a paper which is available on the internet. The finding is not entirely consistent with what other studies have found about colour in relation to emergency vehicles. In the paper, she says that what they found in New Zealand may be the result of the fact that police officers there are associated with white - can't remember right now whether it's that police cars are white or that they use white helmets. She raised the possibility that in the absence of that kind of social conditioning/recognition, yellow or orange may be equally or more visible.
Shoei (but not Arai or Shark for some reason) makes helmets in solid white, orange and yellow. Having read the paper and a couple on emergency vehicles/school buses, and thinking about the geographic colours where I live, I decided to go with yellow. My bike is white :)