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There was a study several years ago that showed people who use their headlights all the time get in less accidents. I've never been convinced the headlights made the difference. People who do things like that are probably more careful drivers, and a car with headlights on in the daytime was unusual. It seemed to me those things probably accounted for the safety difference. Anyway, Canada passed a law saying all cars have to have headlights on all the time. Maybe it's just for new cars; I'm not sure. I think it was backed by GM. GM came out with the marketing scheme of daytime running lights (DRL), and new GM cars have all had them for about 7 or 8 years now. The headlights aren't on; just the parking lights. I don't know of any follow-up studies on whether DRLs make a difference. I assume they don't when I'm driving. I also turn on my headlights earlier than many, and leave them on later than many. Headlights don't cost very much so I don't care if I wear them out faster. Another thing I do, if I don't have my headlights on, but see a few other cars which do, I turn mine on too. If other people think they need them, maybe they really do.
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