When the sunshine passes through atmosphere, it gets scattered by tiny air particles. The scattering of sunshine is reciprocally proportional to the number of its wavelength. because the red light-weight has the best wavelength among all the colors, thus it’s scattered the smallest amount. thanks to that most of the sunshine gets mirrored back and may travel longer distances through rain, fog, dust etc. to succeed in our eyes effectively.

It is all regarding scattering result of lights with completely different colors. Less the scattering causes larger distance of traveling the sunshine. Less scattering is additionally helps the sunshine to travel through fog, cloud, dust e.t.c.

The scattering of sunshine is reciprocally proportional to the number of the wavelenght of the sunshine.

Red color has larger wavelength than the other color. that the scattering {of light-weight|of sunshine} is a smaller amount for red light that results in traveling of larger distance. Thats why red light-weight is employed for danger signal. so it may be visible from so much distance.