Meaning of the word "sleeping policeman" in English

What does "sleeping policeman" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sleeping policeman

US /ˈsliːpɪŋ ˈpɒlɪsmən/
UK /ˈsliːpɪŋ ˈpɒlɪsmən/

Noun

a raised area built across a road to make traffic go slower

Example:
Be careful, there's a sleeping policeman ahead.
The car bounced over the sleeping policeman.