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

For the seat belt to be effective, it is essential that it is **properly fastened and adjusted** to the body. The **chest strap** should pass over the collarbone, between the shoulder and the neck, and go down the center of the chest. The **lap belt** should be placed over the hip bones, always below the stomach. Incorrect placement can cause serious injuries in the event of an accident.


Additionally, it is important to avoid the **submarining effect**, which occurs when the body slides under the belt during an accident. To prevent this, the belt must be well adjusted, and the seat should not be reclined backward.


In summary, the seat belt is effective in reducing the severity of injuries in the event of an accident, as long as it is used properly.