Red means "stop," green means "go," and yellow means "hurry up and make that damn light." Why those colors, though? I have to admit that aside from a hunch that it had to do with wavelengths, I had no idea myself, so I decided to look into it.
The answer, as it turns out, is a little convoluted, but makes sense.
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They were red and green, gas-powered, and more than a little dangerous in the event of a leak.
Signal splitters receive 4-20m A process current inputs and provide two identical isolated 4-20m A output signals.
Each channel operates independently and is isolated from the others to prevent interaction between channels.
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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.