Dim your headlights for oncoming vehicles or when you are within 300 feet of a vehicle:

You have already passed.
You are approaching from behind.
Approaching you from behind.
That is parked along the side of the road.
Explanation

Although high beam headlights allow you to see twice as far as low beams, they should only be used when you aren't close to other drivers. Dim your headlights to low beams when you find yourself within 500 feet of an oncoming vehicle, or within 300 feet of a vehicle in front of you.

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