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The color red is used for the spectrum of light it falls in. Each spectrum has a different wavelength. Blue for example has a very high frequency/short wavelength causing the sky to be blue because it refracts off many many more particles before it arrives at your eye. Sunsets are orange/yellow/red because that end of the spectrum has much slower frequency and long wavelength allowing it to travel much further. So red is stop because you need to be aware of the "warning/danger" signal much further out than you would of a "safe/all clear"

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Q: Why does red mean stop and green mean go?
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Related questions

What is the stop and go?

red=stop green=go


Stop is to go as red is to?

green


What does a red light mean?

It means you should stop and wait for a green light to go through the intersection.


When do you go on red and stop on green?

when your eating watermelon


Green is to as red is to danger?

Green is to red as danger is to safety. Green is the color of peace. Red is the color of danger or warning. Red=stop Green=go They are opposites.


Why is there more than one light on on a traffic light?

The lights mean different things. The green one means it's safe to go. The amber one means get ready to go and the red one means don't go or stop. :) The green means you can go if the road is clear ! The Amber means stop! The red means stop!


What are the colors displayed on a stop light?

The colors on a stop light are red, green, and yellow. On the stoplight, red is the top color, yellow is the middle, and green is on the bottom. Green means go, red means stop, and yellow is a warning that red is coming.


When do stop on green and go on red?

when you're eating a watermelon!


When should you stop at green and go at red?

When you are eating a watermelon


What are the phases of a traffic light?

Red - Stop Yellow - Prepare to Stop Green - Go


When do you go on red but stop at green?

You stop on green when the conditions are unsafe to proceed. Just because the light is green doesn't mean that you have an unobstructed path in which to drive. You never proceed on a solid red light unless instructed to do so by a police officer. A blinking red light means to stop and proceed when it is safe to do so ... just like a stop sign.


What is the answer to this riddle when do you go at red and stop at green?

When you're eating a watermelon