A pinchpoint is created by the narrow clearance between the rotating superstructure (cab) of a crane and the stationary carrier frame. When a crane must be used in a confined space, another dangerous pinchpoint is the close clearance between the rotating cab/counterweight and a wall, post or other stationary object. This hazard is inherent in rough terrain cranes, truck-mounted cranes, crawler cranes and other mobile cranes. Many people, especially oilers, have been crushed by such pinchpoints.