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All answers having "Traffic stopper" as clue:

3 Character Answers:

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RED



4 Character Answers:

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NARC



5 Character Answers:

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SIREN

TRAIN

TRUCK



6 Character Answers:

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PARADE

PILEUP



8 Character Answers:

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REDLIGHT



9 Character Answers:

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HOTNUMBER

SPEEDTRAP



10 Character Answers:

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DRAWBRIDGE



13 Character Answers:

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CROSSINGGUARD