Longman Dictionary of Contemporary English
traffic calming
noun
EXAMPLES FROM CORPUS
▪ According to the state's traffic planning department, traffic calming had improved the economic performance of cities like Dusseldorf.
▪ Extend traffic calming measures in residential streets.
▪ Meanwhile, corner shop keeper Frank Allan has repeated a call for traffic calming measures in the surrounding alleyways.
▪ The point needs to be made too that although aesthetic benefits are welcome, the purpose of traffic calming has broader goals.
▪ The simplest form of traffic calming used in Mainz is the re-organisation of parking.
▪ They would like to see traffic calming ramps or even just more signs reminding drivers of the speed limit.
Wiktionary
traffic calming
n. The deliberate slowing of traffic in residential areas by the installation of obstacles to progress
Wikipedia
Traffic calming
Traffic calming uses physical design and other measures to improve safety for motorists, pedestrians and cyclists. It aims to encourage safer, more responsible driving and potentially reduce traffic flow. Urban planners and traffic engineers have many strategies for traffic calming, including narrowed roads and speed humps. Such measures are common in Australia and Europe (especially Northern Europe), but less so in North America. Traffic calming is a calque (literal translation) of the German word Verkehrsberuhigung - the term's first published use in English was in 1985 by Carmen Hass-Klau.