Cars in Canada can now be sold without daytime running lights. It is a great help, not on bright sunny days, but on gray rainy days, or even really cloudy days it makes it really easy to see traffic. I think the most profound effect is on your periferal vision. You pick up the lights in your periferal much quicker than cars without light on. I don't have daytime running lights, but I always turn my lights on whenever I drive. It's become a habbit; seat belt, check mirors and seat position, turn on ignition, turn on lights, pull brake release lever, then put it in gear and go. Just like frequent and regular hot oil changes protect your engine, taking frequent and regular steps to ensure safety no matter how unnecessary they may seem can only do good.
1995 E420 - retired
1986 420SEL - retired