Thanks, Dan, I sort of suspected that it was the case with improved visibility. I wonder if at the time of the studies the Hiviz Yellow helmets were available and if they are either better or worse in this category. I bought my newest helmet in Hiviz yellow figuring it would help.
Ride and ride safe,
Curt
Remember: the better of the two studies was in New Zealand and took about ten years to complete. The other was European--primarily Germany and France. Motorcycling in those places may have different risk factors than here in the US. But with a 24% fatality reduction, I don't care if the results are overstated for American motorcyclists by a factor of ten--I am giving up my black helmet. As a fashion statement, well...I can't see it when I'm wearing it anyway.
I know the most easily seen color is white, the most easily noticed colors are luminescent orange, yellow and green in that order. The New Zealand study compared white with green, yellow and orange, as well as other colors. The New Zealand study did not include any of the luminescent colors. It did compare reflective stripes and found them to be helpful only at night. I seldom ride at night.
There have been absolutely no US based studies on this. So, what I did was to start watching motorcyclists when I'm in my cage. My non-scientific assessment seemed to support the New Zealand study. Someday, watch a sprt bike from the back. All you really see is a big black tire and a helmet! I noticed a cruiser the other day that had a white shirt and a black helmet. That seemed to be more noticible to me than all black, but not as much as a black shirt and a white helmet. So, start looking at other bikers when you are in your cage, and decide what you think.
I sat down with one of my engineering professor buddies at the university about six months ago, and discussed this over lunch. This guy is a PhD in human factors engineering. He said in the daytime he didn't think there would be much difference between white and the luminescent colors. However, he stated at night white is best--especially refective white.
So, I bought a white one. My old one was flat black. If I had originally owned a luminescent one, I probably would have waited until I normally would have bought a new one. I like to replace my helmet every three years or so. They just get so beat-up--inside and out. I ride about 1,500 miles a month, so I guess that makes sense.
oh, by the way, my wife has a luminescent pink one! She said "No!" To white. (See the exclamation point?)