Seat belts in cars routinely secure passengers for daily trips. The webbing pulls out from a retractor to match the distance across the body. It fastens into a buckle and holds steady during smooth turns and stops.
When more length is required, the belt uncoils extensively from its storage spool.
Near the limit of extension, nearly all the webbing has uncoiled. Only a short segment remains wound inside the retractor. Upon unbuckling, the belt rewinds evenly into its compartment.
In this state, the belt stays in place without unintended movement. It responds to abrupt motions by engaging its hold. Normal adjustments in seating position remain possible, though with constrained play.
The seat belt continues to operate effectively within its extension boundary, preserving function amid minimal reserve length.