The Mechanism operates through a spool that tightly coils the seat belt webbing when it is not being pulled. When a sudden stop occurs, the retractor locks in place, thereby preventing excessive movement of the occupant, which significantly reduces the risk of injury. NHTSA has reviewed the regulatory Liedtext sections https://wikimapia.org/external_link?url=https://www.ledteks.com/seatbelt-and-safety-belt-webbing