At night, you must use __________ whenever you are within 200 feet of a vehicle you are following.

Explanation

The bright light of high-beam headlights can be blinding. Under Virginia law, you must dim your headlights to low beam whenever you are within 500 feet of an oncoming vehicle or within 200 feet of a vehicle you are following. You must also dim your headlights whenever roadway lighting is sufficient to let you see 350 feet ahead.