500 feet if the vehicle is coming to you, 300 feet if you are following it.
If you can see the oncoming vehicle then he can see you. Dim your lights at that time.
Within 500 feet of oncoming traffic.
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.
500ft if it's oncoming. 350ft if you're coming up behind someone.
No, you will dazzle the oncoming driver.
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.
Use of Bright Beam HeadlightsUsually the use of bright beam headlights is allowed on most major highways, with the exception that most traffic codes REQUIRE that they be switched to the low beams when there is oncoming traffic.The purpose of this is to prevent or reduce the glare and chances of "blinding" the driver of oncoming vehicles, and thus to increase safety on the highways.It is not only RUDE AND CRUDE to fail to dim your headlights for oncoming traffic, but it also is usually a violation of the law.
at least 2m
500 to 1000 ft.
It is safe to use the bright [highbeam] headlights when there is no oncoming traffic/drivers who could be blinded by the bright light. Also, it is unsafe to use highbeams when there is fog or smoke which would reflect the light back to you, thus reducing the distance which you can see.
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.