Impromptu signal to slow down

This crossword clue is for the definition: Impromptu signal to slow down.
it’s A 29 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term “Impromptu signal to slow down crossword” or “Impromptu signal to slow down crossword clue”. The possible answerss for Impromptu signal to slow down are listed below.

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Possible Answers: ROAD FLARE.

Last seen on: NY Times Crossword 12 Jan 22, Wednesday