A Wheel Chock is a wedge of sturdy, durable material that is used to prevent the accidental movement of a vehicle. It is commonly attached to vehicles docked at loading bays; It is placed snugly against the wheels of the vehicle, thin-edge forward, in order to block the vehicle from moving in the direction of the chock. It is most often placed against the rear side of the vehicles wheels to prevent accidental backward movement but may also be used to block forward movement. Wheel chock is an important and mandatory hazard control in many industries in which wheeled vehicles are present.