Answer / naveen

"VIBGYOR" THE COLOUR COMBINATIONS OF A RAINBOW.
'R' STANDS FOR RED
'Y' FOR YELLOW
'G' FOR GREEN
THE INTENSITY OF THE RED LIGHT IS VERY HIGH COMPARED TO
YELLOW AND GREEN.AND THE INTENSITY OF YELLOW AND GREEN IS
VERY HIGH COMPARED TO VIOLET,INDIGO,BLUE.SO THAT'S WHY
GREEN,YELLOW,RED ARE USED IN TRAFFIC LIGHT.

Answer / ashhad khan

red colour has the longest wavelength so it will be visible from the longest distance compared to other colours

yellow and green has less wavelength then red but for these two colours our eye retina has highest sensitivity so our eye can see and detect those two colours with greater accuracy compared to other colours. Thus these three colours were selected for the signals.


by ashhad khan

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