n. A speed hump or speed bump.
In Atlanta, Dallas, San Francisco and other cities, the speed hump, or bump, popularly known as the sleeping policeman, has been gaining in popularity.
You can be 'radared' from overhead but, as in France, if there is a trap threatening, other drivers will flash a warning; though helicopters are not yet, to my knowledge used across the Channel. And you will find many warning notices of speed detection devices by the road side — something of a sleeping policeman device but worth bearing in mind.
When you hear a Jamaican talk about his country's "sleeping policemen," he isn't implying that Jamaican lawmen aren't wide awake. The term "sleeping policeman" is used to describe the hump built across streets to slow down speeders,