The light from beam headlights may cause glare. That is why you must use low beam headlights when you meet oncoming vehicles or approach another vehicle from behind. You should also use low beams in lighted areas, such as cities. To avoid blinding yourself you should also use low beams when driving in fog, heavy rain, or snow.
Many users are confused about when to use of low beam and high beam headlights. Think about this: low beams let you see about 200 feet ahead. It can take about 200 feet to stop when you drive at 30 mph. That is almost half a city block in length. If you cannot see 200 feet ahead, you may not be driving safely at 30 mph. By the time you see an object in your path, it may be too late to stop without hitting it. Headlights on "upper" or "high" beam let you see about 350-400 feet ahead. 400 feet is your approximately stopping distance when driving at 50-55 mph. That is about the length of a city block. In other words, high beams let you see twice as far as low beams.
You must turn on headlights 30 minutes after sunset and 30 minutes before sunrise. Why is it 30 minutes after sunset and not before? Wouldn't it be more logical to turn on your headlights before sunset? I mean, isn't it dark as soon as the sun sets?
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