we have had daytime running lights as a standard feature on cars in Canada for at least 20 yrs. If not more. You don't even think about it there, you turn on your car, your running lights come on. They are especially good to have during the times of day when it is hardest to see -- which is not in the middle of the night, but actually at twilight / dusk when the sun is transitioning. And as mentioned yes makes sense for tunnels. Here frankly it makes sense as well for all the tinted windows there are. People tint their windows extremely dark, and if the cars behind you have running lights on it's easier to see.