reversing light

15 LETTERS · STARTS WITH R

reversing light is a valid 15-letter word worth 22 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1E1V4E1R1S1I1N1G2L1I1G2H4T1

1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 1 + 1 + 2 + 4 + 1 =22 PTS

DOUBLE WORD → 44TRIPLE WORD → 66

MEANING

What does reversing light mean?