Question

in motor vehicles red and orange color are preferable for signals. why

Answer 1

it is because red light gets least scattered away and thus has the largest wavelength to reach to viewrs eyes...while blue gets scattered away by the particles present in the atmosphere

Answer 2

$<font color="blue">Yes, because the wavelength of red and orange colour are longer and the scattering of light is inversely proportional to <font color="green">four power of wavelength (X^4) </font> So, the bigger the wavelength it will scatter the least so it prevents from losing the path of light.Hence it's also use in traffic to symbolise danger.</font>$