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Ah yes, the "pause traffic laws" button
(startrek.website)
Post memes here.
A meme is an idea, behavior, or style that spreads by means of imitation from person to person within a culture and often carries symbolic meaning representing a particular phenomenon or theme.
An Internet meme or meme, is a cultural item that is spread via the Internet, often through social media platforms. The name is by the concept of memes proposed by Richard Dawkins in 1972. Internet memes can take various forms, such as images, videos, GIFs, and various other viral sensations.
Laittakaa meemejä tänne.
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.