My van had 7" Marchal headlights, that would burn the paint off the car in front at a light. I was always super careful to dim the before the oncoming cars popped up over a hill. Out west I could see those reflectors along the road for over a mile. Anyway, my buddy took it to Florida pulling a trailer with three Harleys on it, and a trucker on the CB told him to back off. he asked how far and the guy says, about a mile.