Question

Red lights are used as warning signals at road crossing. Why?​

Answer 1

Answer:

BECAUSE RED LIGHT WILL APPEAR FOR LONG DISTANCE.

BECAUSE IT'S WAVE LENGTH IS MORE

THAT'S WHY RED LIGHT IS USED FOR WARNING SIGNELS AND IN TRAFFIC SIGNELS

Explanation:

HOPE IT WILL HELP YOU

PLZZ MARK AS BRAINLIST

Answer 2

Answer:

The primary reason is why the colour red us used for danger signals is that red light is scattered by least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour.... So red light is able to travel the longest distance through fog, rain, and alike.