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well, yea that's what I thought :)
but we don't have traffic lights like that in America and I never seen in other European countries either

Oh really? In Poland they have similar. But instead of letters, they have lines. Btw these signalizations are​ only​ for public transport. :D

I've been to Poland when I was a kid, I don't even remember anything , but yeah ... most countries don't have it . this was my first time seeing something like that.