Originally Posted by
chrisb71
http://ibiblio.org/rdu/DRLs/studies.htm
http://www.bmj.com/content/328/7444/857.full
edit: Every study says lights help, there are simply no studies saying how much light helps. While certainly there is probably a dropoff in effectiveness depending on how bright the light is, what is that dropoff? What amount of lumens do you need to still be effective? A blanket statement like "bike lights won't work" is not based on any science.
Wow, where's the science related to onlyh bicycles on those two sites? There was not one, it was about cars and motorcycles which all use much larger lights then on a bicycle thus quicker to see in the daytime. A car moving at 45mph is not going to notice a little 1 1/2 inch diameter headlight, they might notice it if it's flashing, but the key word is might. Cars don't pay the same respect to cyclists as they do to MC's or cars.