Part of me is assuming it was to do with the first traffic lights, but then I also feel like it’s probably older than that. Does it have something to do with military battalions perhaps?
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Ever notice how when the lights are green some times you don’t even notice them? Red catches your eye even if you’re not 100% paying attention? In nature red is the color of danger: fire, blood, etc. Deep in our lizard brains we’re programmed to pay attention to the color red.
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