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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It’s purely down to culture, and specifically the American and British railroads. Track signals, when they began to use lights, used a white light for “Go” and a red light for “Stop”, it was believed that there was a good distinction between the two at a distance, and that red drew our attention.
Then one sad day, the red glass over the “stop” broke, and oh no… suddenly you just have two white lights. There was an accident, and after that it was decided to have two different colors, so if you saw a white light, you’d know it was broken and default to a stop. The color chosen was green, again because it’s highly visible to the human eye.
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