Why red colour is used in traffic signals?

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If we consider the VIBGYOR, then we can notice that red is at last, which means that the red colour has the highest wavelength. The main reason why the red colour is used to in the traffic signals to stop the vehicle is that red is scattered the least by the air molecules. For a particular colour, the...
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If we consider the VIBGYOR, then we can notice that red is at last, which means that the red colour has the highest wavelength. The main reason why the red colour is used to in the traffic signals to stop the vehicle is that red is scattered the least by the air molecules. For a particular colour, the scattering effect is inversely proportional to the power of wavelength. If th scattering increases, then its wavelength decrease. Since red is the most scattered light, it has the highest wavelength. Therefore, blue is scattered the most and red the least. Red has the highest wavelength of all the colours, and it is scattered the least. So, it can travel the longest distance and can penetrate through rain, mist and fog. This is the read for red being used in traffic signals so that the stop signal is visible from far as well. Also, red is perceived as and associated with danger. It has been genetically programmed that red is the colour of danger. These reasons also contribute to why red is used in traffic signals. read less
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Trainer

as we move towards right of the VIBGYOR, the wavelength tends to increase, and RED is the last color in vibgyor, so RED has the highest wavelength, and the color having the highest wavelength can be seen from large distances, so it is convenient for the vehicles.
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Experienced Mathematics com ECE Educator

Red colour has longest wavelength. Since it is visible from a long distance, it is used in traffic signals
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labhome

it have more wave length
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Red colour, due to its longer wavelength does not get scattered by the particles in the atmosphere and hence reaches our eyes more distinctly than the other colours minus much scattering. Hence, red colour is used for stop in traffic signals.
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Because red colour has large wavelength and therefore it is visible from long distances.
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Red colour has longest wave length .so that it visible from a long distance it is used in traffic signal
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It has the longest wavelength
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Red color has a higher wave length and doesn't get easily scattered by the particles in the atmosephere. This makes it easier to see the red light in a traffic signal.
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