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Traffic light
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=== As a rating mechanism === {{See also|Traffic light rating system|European Union energy label}} The colours red, amber, and green are often used as a simple-to-understand rating system for products and processes. It may be extended by analogy to provide a greater range of intermediate colours, with red and green at the extremes.<ref>{{cite web|title=Traffic Light Song|website = [[YouTube]]| date=16 June 2017 |url=https://www.youtube.com/watch?v=db0HqnDU5MI |archive-url=https://ghostarchive.org/varchive/youtube/20211211/db0HqnDU5MI| archive-date=11 December 2021 |url-status=live}}{{cbignore}}</ref>
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