If you're driving in blinding snow at night, it's easier to see with your lights off. Wouldn't reccommend it for anything but lonely roads, but it can keep you out of a ditch till you can get somewhere. Also makes it easier to see oncoming traffic, at which point you can turn 'em back on. And on the snow subject, if there is a full moon and snow it's a lot easier hunting rabbits at night. (Legal here w/o artificial light)