The **seat belt** is a crucial element for **passive safety** in vehicles. Its main function is to **protect the occupants** in the event of an accident, preventing them from moving from their seats or being ejected from the vehicle. This significantly increases the chances of **surviving an accident**, as it reduces the risk of serious or fatal injuries.

Furthermore, the proper use of the seat belt not only protects the person wearing it but also **prevents them from causing injuries to other occupants**. In an accident, a person without a seat belt can become a projectile inside the vehicle, endangering other passengers.

Therefore, the seat belt in the rear seats **can save lives** and is essential for the safety of all vehicle occupants.