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Starting in 1996, all passenger vehicles were required to lock pre-crash, meaning they have a locking mechanism in the retractor or in the latch plate. [43] Seat belts are stowed on spring-loaded reels called "retractors" equipped with inertial locking mechanisms that stop the belt from extending off the reel during severe deceleration. [44]
Once the seatbelt was extended beyond 7 - 10 inches (for example, as the belt was being fastened) a locking mechanism would engage to prevent the seatbelt from extending further, thus securing the individual into the seat. However, if the belt were allowed to retract back to 7 - 10 inches, then the locking mechanism would disengage and the belt ...
Restraints always use two locking mechanisms, one on each side, for redundancy. If one fails, the restraint will remain locked. Most modern roller coasters also have seat belts that may act as secondary safety devices. On over-the-shoulder restraints, this seatbelt is mostly cosmetic as the restraint locks on its own.
The terms "active" and "passive" are simple but important terms in the world of automotive safety. "Active safety" is used to refer to technology assisting in the prevention of a crash and "passive safety" to components of the vehicle (primarily airbags, seatbelts and the physical structure of the vehicle) that help to protect occupants during a crash.
Other forms of safety harnesses include seat belts and child safety seats in cars, which are helping passengers be and feel more safe in a car, Over-the-shoulder restraints, which are mainly used on roller coaster at amusement parks, a seat with a full-body harness like ones used by fighter pilots and racing car drivers, as well as diving ...
Dependent on an airline's choice of installation, airplane airbags are most often installed in First class, Business class, Premium Economy, and Economy bulkhead/exit row seats. The use of seat belt extenders deactivates the airbag mechanism, so some airlines require seat belt extender users to be reassigned to seats without airbags.