It perfectly depends on where you live or drive. You should dim your headlights right when you see another vehicle in front of you or right when you see the lights of another vehicle. It doesn't matter if you are seeing the tail lamp (both of you are traveling in the same direction), you should dim the lights or else it is going to make difficulties for the driver in front.
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.
500 feet if the vehicle is coming to you, 300 feet if you are following it.
No, you will dazzle the oncoming driver.
Within 500 feet of oncoming traffic.
At night a driver should dim his headlights when an oncoming motor vehicle comes within 1,000 feet. You should switch your headlights from full beam to dipped beam when a oncoming car passes. It is unsafe to leave your headlights on full beam as it blinds the driver of the oncoming car.
At night a driver should dim his headlights when an oncoming motor vehicle comes within 1,000 feet. You should switch your headlights from full beam to dipped beam when a oncoming car passes. It is unsafe to leave your headlights on full beam as it blinds the driver of the oncoming car.
It is safe to use your bright headlights if there is a car ahead of you within 300 feet.
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.
At night a driver should dim his headlights when an oncoming motor vehicle comes within 1,000 feet. You should switch your headlights from full beam to dipped beam when a oncoming car passes. It is unsafe to leave your headlights on full beam as it blinds the driver of the oncoming car.
in florida you must dim your headlights from the oncoming traffic at 500 feet. and from the rear at 300 feet.
500ft if it's oncoming. 350ft if you're coming up behind someone.
Here in California, by law it's 500 feet (a football field-and-a-half), but be kind and dim your bright lights well before that.