Wheel Clamp

A wheel clamp, also known as wheel boot or Denver boot, is a device that is designed to prevent vehicles from being moved. In its most common form, it consists of a clamp that surrounds a vehicle wheel, designed to prevent removal of both itself and the wheel.

In the United States, these devices became known as a "Denver boot" after the city of Denver, Colorado was the first in the country to employ them, mostly to force the payment of outstanding parking tickets.