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They could be trying to get your attention if you're veering into their lane, they could be asking you to dim your high beams (if your headlights are poorly adjusted, it might make it seem to them like you have high beams on), they could be signaling that your lights aren't turned on, they could be trying to warn you that the police have set up a speed trap ahead of you (while this is usually done by turning the headlights off and on, vehicles with daytime running lights may not be able to do this, and may opt to flash headlights, instead).
Another reason, if you're traveling in the same direction, and particularly if you're pulling a trailer, is that they may be doing it to signal that you've cleared their vehicle and can occupy the lane. A little pro tip here: don't do that to tractor trailers. All you end up doing is flashing bright light into their eyes via their mirrors. They're professionals, they know where their trailer is. If you don't signal them, they'll be able to gauge it themselves. This is also a bit dangerous, because flashing high beams in such an instance is traditionally an indication that you intend to pass someone. So, if you get an older driver who flashes their high beams signaling their intent to pass, and a younger driver who interprets it as an indication that they're clear to change lanes, you have a conflict which can lead to an accident.
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If its a sunny day outside, you might want to wear sunglasses. At night, just make sure your headlights are on. And what about the height lights of the cars coming?
Why both headlights are out on a 2001 Ford Escape?
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