Who decided that red means "stop" and green means "go"? Apparently it was pre-auto. The railroads first started using red for stop in the 1830s. They used white for go in those days, but that had some disastrous consequences, and had to be changed. When the first electric traffic signals were installed in Cleveland, Ohio, in 1914, the conventions had already developed, and those first signals used red and green indications. The first modern automatic traffic signals used red, yellow, and green; and that stuck.
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