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If you can see the area lit by their headlights, then you are probably close enough to dim your own.
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.
never
500 feet if the vehicle is coming to you, 300 feet if you are following it.
in florida you must dim your headlights from the oncoming traffic at 500 feet. and from the rear at 300 feet.
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.
at least 2m
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.
In most states it is 500 Feet. Common sense should prevail.
500 to 1000 ft.
according to Florida handsbook, you must dim your bright headlights within 300 feet of the vehicle ahead.