In Canada, DRL is mandetory.
Why? Several studies found that it reduces accidents.
The biggest reduction was in pedetrian accidents. No idea how a person could NOT notice a car coming, but apparently many people do. With the lights on, pedestrian accidents were reduced by.... 20%? Sorry, its an old study, I dont rem the #s.
My truck did not come with DRLs. I have rigged a set of Piaa Deno fog lights, so that they turn on all the time.
It does have a switch to turn it off, but I never use it.
2bits.
tdk.