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Why were red, yellow and green chosen as the colors for traffic lights?

April 26, 2017chosen highways lights red Roads streets Traffic Transportation Yellow

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Why were red, yellow and green chosen as the colors for traffic lights?

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The color red is used to signify danger. The color was chosen long ago and likely originated from a fear of fire or its embers. The color green was chosen because it is the uniquely visible as “Not Red.” Amber is a colour half way between the two.