Definition of rumble strip noun from the Oxford Advanced Learner's Dictionary

 

rumble strip

 noun
noun
BrE
 
; NAmE
 
(informal) Controlling traffic
 
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a series of raised strips across a road or along its edge that make a loud noise when a vehicle drives over them in order to warn the driver to go slower or that he or she is too close to the edge of the road See related entries: Controlling traffic
See the Oxford Advanced American Dictionary entry: rumble strip