Answer: radargun

AnswerCrossword Clue
RADARGUNSpeeder catcher
RADARGUNSpeed trap device
RADARGUNIt may be pointed at a moving vehicle
RADARGUNHigh-speed measurer
RADARGUNTraffic cop's device
RADARGUNTrooper's weapon?
RADARGUNTrooper's device
RADARGUNTrooper's tool
RADARGUNSpeed reader?
RADARGUNSpeed gauge
RADARGUNSpeedster's undoing