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Why do traffic lights have red, yellow and green color?

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To maintain standardization internationally, every industrilized nation (those with widespread access to generated electricity) has implemented the green, amber, and red traffic signal coloring. Some jurisdictions in some areas place the signals horizontally, but most place the signal lights vertically as you are used to. read more

To maintain standardization internationally, every industrilized nation (those with widespread access to generated electricity) has implemented the green, amber, and red traffic signal coloring. read more

Green's role in lights has actually changed dramatically over time. Its wavelength is next to (and shorter than) yellow's on the visible spectrum, meaning it's still easier to see than any color other than red and yellow. Back in the early days of railway lights, green originally meant"caution," while the"all-clear" light was, well, clear or white. read more

Well, it’s important to know that before traffic lights for cars even became a thing, there were traffic signals for trains. At first, railroad companies used red to mean stop, white to mean go, and green to mean caution. read more

Source: rd.com

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