speed bump

n.

A speed bump (British English a speed or road hump, sometimes colloquially a sleeping policeman) is a traffic calming tool designed to slow traffic or reduce through traffic. A speed bump is a bump in a roadway that may be circular, parabolic, or sinusoidal, and it may have gaps near the curb to allow drainage. The speed at which a vehicle can safety pass a bump decreases with the bump's slope.

goose bumps

pl.n. American English

Momentary roughness of the skin caused by erection of the papillae in response to cold or fear.

A Goose bump is called a goose bump because a human with a goose bump looks like a freshly plucked goose.

Also called goose pimples, and goose flesh in British English.