How does seat belt locks work?

Seat belt locks work by using a mechanism within the seat belt retractor that engages when the belt is pulled out and suddenly released. This mechanism, often a locking latch plate or a retracting spool, prevents the belt from retracting, securing the occupant in place during a sudden stop or collision. Some vehicles also have an additional feature where the seat belt locks when the vehicle is in a crash or if the belt is anchored incorrectly. This ensures that the seat belt remains tight and effective in protecting passengers.