Originally Posted by
noglider
FBinNY, I disagree that a tail light is more important than a headlight. Given that the two most common car/bike accidents where the motorist is at fault are the left hook (from ahead) and the right hook (from behind), I'd imagine that a headlight helps to prevent these maneuvers than a taillight. Granted, a tail light can help prevent the right hook, too. Still, I think a headlight is slightly more important than a tail light.
Having said that, I insist on using both, and I don't see the need for choosing which of them to use.
I agree that both is the only way to go. But consider that accident statistics are weighted toward mostly daytime riding. Otherwise we are passed from behind by vastly more cars than we encounter making turns at intersections. Also a cyclist is aware of what's happening around him, he can adjust to turning cars (which he sees) but has no control over cars coming up from behind.
If I'm going to be invisible, let it not be to those in the same lane closing on me at a significant speed difference.
I've lost lights at night. I've ridden without a headlight, and while I don't relish it, I find it manageable. If I lose my tail light, I take to the sidewalk.