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1

A head light addresses cross traffic and head on traffic. Too often vehicles are looking for vehicles and don't see a bike that is in plain site. My experience is that yes a strong flashing light in daylight helps being seen. I live in a large city that is not particularly bike friendly and I definitely feel it helps. I took these picture through my ...


17

According to Safety effects of permanent running lights for bicycles: A controlled experiment. (Madsen JC1, Andersen T, Lahrmann HS.) they give about a 19% reduction in crash rates. There's a copy of the paper in Scribd as pdf. Every reference I've been able to find appears to refer to this one study. The incidence rate, including all recorded bicycle ...


5

So, I've done a lot of (non-academic) research on bike lights for this site's community blog and more recently for the bike lights resource site I created, The Bike Light Database. There is a disappointing lack of hard scientific data on bike lighting at all, and essentially none regarding this specific question. I can tell you from extensive anecdotal ...


3

Most automobiles in the US now include daytime running lights, since there were studies showing that this did increase other drivers' awareness of them. If you want the scientific studies, knowing that the keywords are "automobile daytime running lights" is likely to help you find them. It isn't entirely clear whether that effect fades when daytime running ...


1

Be seen lights can be rougly divided into two categories: focused and diffuse beams. Focused lights are much like to-see lights, they're just not actually bright enough to see with. They focus the light into a rougly circular shape that points mostly towards the front (or back) of the bike. Diffuse beams spread light much more evenly, and while they might ...



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