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use low beam lights within 300ft of on coming vehicles
Headlights are required to be on from sunset to sunrise, and any time the visibility is less than 1000 feet.
500
5PM to 6AM
No
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.
No, you will dazzle the oncoming driver.
Due to law changes headlights technically are allowed on at all times even during the day and MUST be on in the evening when it starts to get dark
185 metres
you must use your headlights between one-half hour after sunset to one-half hour before sunrise, or anytime when person or vehicles cannot be seen
Motor Vehicle law states that headlights MUST be used after sunset. IN some states they must be used all of the time, when it's raining or snowing or when conditions require it. If you have an accident because you choose not to use your headlights, your insurance company will probably not pay anything for it.
it's an illegal to use a different colored headlights.