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English definition of “traffic calming”

traffic calming

noun [U]     UK
the act of building raised areas , small roundabouts , or other similar structures on roads , usually roads where there are houses , so that vehicles are forced to move more slowly along them: [before noun] traffic-calming measures Road surfaces and featuresTraffic jams
(Definition of traffic calming noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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