Answer: radargun

AnswerCrossword Clue
RADARGUN

Speeder catcher

RADARGUN

Speed trap device

RADARGUN

It may be pointed at a moving vehicle

RADARGUN
High-speed measurer
RADARGUN
Traffic cop's device
RADARGUNTrooper's weapon?
RADARGUNTrooper's device
RADARGUNTrooper's tool
RADARGUNSpeed reader?
RADARGUNSpeed gauge
RADARGUNSpeedster's undoing