From Portland Afoot
A speed hump is a wide, raised bump in the street that prompts motor vehicles to slow down, usually to between 10 and 20 mph. They're used for traffic calming on neighborhood greenways in Portland, which feature speed humps every 325 to 350 feet.
Each speed hump costs about $2,500 to install, city project manager Greg Raisman estimated in summer 2012.
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