The **seat belt** is a crucial element of **passive safety** in vehicles. Its main function is to **restrain and protect** occupants in the event of an accident. This is achieved by keeping people in their seats and preventing them from being ejected from the vehicle during an impact or rollover. Using the seat belt correctly can double the chances of surviving an accident.

For the seat belt to be effective, it must be well adjusted to the body and correctly attached to the vehicle's bodywork. Additionally, it is important to check it periodically to ensure it has no defects.

A problem that can occur if the seat belt is not properly positioned is the **submarining effect**, where the body slides under the belt during an accident. To avoid this, it is essential to fasten the belt properly, adjust it correctly, and maintain a proper posture while driving.


In summary, the seat belt is fundamental for **restraining and protecting** vehicle occupants in the event of an accident, making it an essential device for road safety.