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Originally Posted by tyler88
what is teh purpose of the quick flash of the brights?...tell people cops ahead or just to say hi?...sounds pretty useless 
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The quick flash is a signaling device. It is for the purpose of getting someones attension.
It is used in Europe and other places in the world, on multi lane highways, to signal a slower car in front of you that you would like them to move out of the passing lane so you can pass them. It is also used to signal another driver at an intersection, for instance, that you are yeilding right-of-way for them to procede. It can be used to warn someone who might have not seen you and is planning to pull out in front of you that you are comming. It can also be used to let a friend that you are following know that you have a problem and need to stop. If it is used correctly it can be quite helpful.
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'88 Corolla, AE92 SR-5, 7A-FE swap/GT-S suspension
'87 Corolla, AE82 FX-16, 4A-GZE swap (autocrosser)
'03 Tundra 4X4 Access Cab, (FX tow vehicle/Home Depot runner)

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