hazard warning device

21 LETTERS · STARTS WITH H

hazard warning device is a valid 21-letter word worth 42 points in Scrabble and 46 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

H4A1Z10A1R1D2W4A1R1N1I1N1G2D2E1V4I1C3E1

4 + 1 + 10 + 1 + 1 + 2 + 0 + 4 + 1 + 1 + 1 + 1 + 1 + 2 + 0 + 2 + 1 + 4 + 1 + 3 + 1 =42 PTS

DOUBLE WORD → 84TRIPLE WORD → 126

MEANING

What does hazard warning device mean?