Originally Posted by
wphamilton
I came across this review
http://www.visualexpert.com/Resources/motheffect.html which concludes "The "moth-effect" is a myth in one sense and reality in another. The idea that drivers may steer off the road when they fixate flashing lights is likely correct, but they are not drawn to the lights like moths to a flame. Rather, they inadvertently steer rightward, which may or may not take them into collision with the roadside vehicle." They also note that '
Neither study, however, employed bright lights, so it is unlikely that the "moth-effect" results from an innate phototaxis.'
So it sounds like you're both right.
I can tell you anecdotaly that I can be completely blinded by an approaching bike light that comes within a few feet, with impaired vision for two or three seconds. It's not a literal physiological blindness, as you point out, but a temporary loss of the ability to see anything in the direction of travel.
Yes, I do not buy into the moth-effect, nor was I referencing that. People do tend to look at something they are distracted by though and often this is a light that is shining in their eyes irritating them. Since I do a good majority of my driving and motorcycle riding at night, I tend to notice this a lot, and have to work at not staring at a light that is blinding. Of course that is all part of being an active, attentive driver, unfortunately many people, most, are not. I prefer not to shine lights into their eyes. Keeping the light properly adjusted prevents that for the most part.
There are reasons for lighting regulations. It is good to be see, and to be able to see. A bright light is essential for me while riding in town around traffic, but I don't want it shining in their eyes. For one thing it is rude, for another it makes it difficult for them to see anything else, for yet another I don't want them to have yet another reason to decry bicyclists. Thankfully I have the respect of the police in my area when they see my bike properly lit, as well as a good number of car drivers who have talked to me and commented on my lights.