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Haha! In Korea, it's the "I'm sorry!" button when you drive like an asshole.
Oh, I kind of like that.
I learned in Japan that it is a thank you button. Like if someone let's you into a lane, you flash twice to say thank you and turn it off.
I've noticed truck drivers do the same here in the US, so I've started doing this as well as a regular driver.
Commonplace in Ireland too for what it's worth.
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