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seat belt
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Illustration of a car with labeled safety features including airbags, seat belts, safety cage, crumple zones, reinforced doors, padded panels, and child-seat accommodations, highlighting passenger protection systems.
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seat belt

safety device
Also known as: safety belt
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Quick Summary

Illustration of a car with labeled safety features including airbags, seat belts, safety cage, crumple zones, reinforced doors, padded panels, and child-seat accommodations, highlighting passenger protection systems.
automobile safety systems Types of automobile safety systems.

A seat belt is a safety device designed to protect vehicle occupants from injury during an accident. It's a strap that fastens a person to their seat, preventing them from being thrown forward or against the vehicle's interior during sudden stops or collisions.1

The concept of restraining belts dates back to the late 19th century, with early versions primarily used in aircraft. By the mid-20th century, seat belts began appearing in automobiles, with advancements leading to lap belts and shoulder harnesses. Despite evidence of their effectiveness, widespread adoption only occurred after legislation mandated their use. Passive restraint systems, like airbags, were later developed to offer protection without requiring occupant action.1

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2 Britannica Sources
  1. vehicular safety devices
  2. seat belt

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