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500
less than a 1000 feet
Using headlights and taillights will help improve visibility during nighttime driving. Keeping the windshield and mirrors clean will also enhance visibility. Additionally, adjusting the interior lighting to reduce glare can further improve visibility inside the vehicle.
Headlights are required to be on from sunset to sunrise, and any time the visibility is less than 1000 feet.
Any time after six o clock Laws will vary a bit between jurisdictions, but this version from the State Of New Jersey is pretty common; "Proper use of headlights is critical to safe driving. Headlights must be used between one-half hour after sunset and one-half hour before sunrise. Headlights must also be used when visibility is 500 feet or less, when using windshield wipers (during rain, snow and ice) or when encountering fog, mist, smoke or other factors that reduce visibility." Note that many semi trucks will use their headlights 24/7. It's a safety issue. Being seen is important.
300 feet
in florida you must dim your headlights from the oncoming traffic at 500 feet. and from the rear at 300 feet.
500
High beam headlights can illuminate anywhere from 30 meters to 150 meters ahead of the car. This is 98 feet to 492 feet away.
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