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YouTubePhil Edwards
Why traffic lights are red, yellow, and green #history #design #traffic
Sources: https://docs.google.com/document/d/16PDm9dpAkwxCaCp89pt_lqUXwrhPfwpm1pfcOH8Y0dA/edit?usp=sharing More info and sources at bottom. Find me elsewhere: Instagram: https://www.instagram.com/philedwardsinc/ Twitter: https://twitter.com/philedwardsinc Patreon: https://www.patreon.com/philedwardsinc Some music by the inimitable Tom Fox via ...
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