Answer: speedbump

AnswerCrossword Clue
SPEEDBUMPTraffic slower-downer
SPEEDBUMPParking lot feature
SPEEDBUMPTraffic "calming" device
SPEEDBUMPParking-lot feature
SPEEDBUMPTraffic slower
SPEEDBUMPPrivate road feature
SPEEDBUMPHigh school parking lot fixture
SPEEDBUMPLeadfoot deterrent