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You should dim your headlights within 500 feet of the car in front of you. The rule of thumb is, if you can see another car, dim your lights.
the courteous time to dim your headlights is as soon as you see another vehicle, or within one half mile.
A quarter mile. If not correct answer - change the law. California law states - Your high beams have to be dimmed within 300 feet of following another driver and within 500 feet of an oncoming driver.
500 feet if the vehicle is coming to you, 300 feet if you are following it.
at least 2m
500 to 1000 ft.
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.
500 feet
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.
Headlights should be dimmed as soon as the driver is aware that another vehicle is heading towards him, and would be dazzled, even if still in the distance.
Think of it this way, when you see a vehicle. more then likely it sees you, so try to lower the high beams as soon you realize another vehicle is infront of you. The law in Oregon is 350 feet.
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.