speed bump

noun
a rounded ridge built crosswise into the pavement of a road or driveway to force vehicles to slow down.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To speed bump
Example sentences
In effect, the pulse acts as a speed bump for light.
The speed bump geometry you describe is quite severe.
Example: speed bump will not find records with speed bumps.
There would be a speed bump constructed at the entrance to the parking lot.
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