What is one reason why seat belts are required by law?

Seat belts are required by law primarily to reduce the risk of injury during a crash. In the event of an accident, seat belts help secure occupants in their seats, preventing them from being thrown from the vehicle or colliding with interior components. This crucial function significantly decreases the likelihood of severe injuries or fatalities. Research consistently shows that seat belts save lives by ensuring that individuals remain safely restrained, allowing the car's safety systems—such as airbags—to function effectively in the event of a collision.

While preventing passengers from moving around and allowing for easier entry and exit from vehicles are considerations for vehicle safety, they are secondary to the main purpose of securing occupants during a crash. Saving fuel is not a relevant concern associated with seat belt use.