Why is stop signal red in color?
Because of its greater wavelenght
Red has much longer wavelength so less scattering.so this light can propagate long distance without much loss
Red colour has maximum wavelength so we can see it from long distance
Red clr has maximum wavelength as u know the order VIBGYOR and it undergoes minimum scattering thats why ..
Red colour has minimum scattering. It undergoes minimum scattering compare with other VINGYO
I think Becoze of red is primary color and it is saw to very long distances...same here vehicle's backside reduam is also red...