Speed bump
Overview
 
A speed bump (also known as a sleeping policeman, a kipping cop, a slow child; in British English
British English
British English, or English , is the broad term used to distinguish the forms of the English language used in the United Kingdom from forms used elsewhere...

 a speed hump, road hump (not to be confused with the wider speed hump
Speed hump
A speed hump is a rounded traffic calming device used to reduce vehicle speed and volume on residential streets. Humps are placed across the road to slow traffic and are often installed in a series of several humps in order to prevent cars from speeding before and after the hump...

), speed breaker; in New Zealand English
New Zealand English
New Zealand English is the dialect of the English language used in New Zealand.The English language was established in New Zealand by colonists during the 19th century. It is one of "the newest native-speaker variet[ies] of the English language in existence, a variety which has developed and...

 a judder bar; in Hiberno-English
Hiberno-English
Hiberno-English is the dialect of English written and spoken in Ireland .English was first brought to Ireland during the Norman invasion of the late 12th century. Initially it was mainly spoken in an area known as the Pale around Dublin, with Irish spoken throughout the rest of the country...

 a ramp) is a speed-reducing feature of road design to slow traffic or reduce through traffic, via vertical deflection. A speed bump is a bump in a roadway with heights typically ranging between 3 and 4 in (7.6 and 10.2 cm).
 
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