What is a key feature of an Emergency Locking Retractor (ELR)?

An Emergency Locking Retractor (ELR) is designed to enhance the safety of a seatbelt during specific scenarios, including sudden stops or crashes. When a car experiences rapid deceleration, such as during a collision, the ELR mechanism activates to lock the seatbelt, preventing excessive movement of the occupant. This feature helps to secure the individual in their seat and reduces the risk of injury during an accident.

The functionality of engaging during a sudden stop or crash means that the feature is responsive to the conditions of travel rather than solely based on speed or other external factors. The ELR allows for normal seatbelt operation under regular driving conditions, allowing the user to move freely, but it locks the belt when there is a significant force that indicates a potential impact.

This specific operation ensures that the seatbelt remains effective as a safety device during critical moments, where its purpose is most vital, thereby reinforcing the protection it provides.