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 moving from their seats or being ejected from the vehicle. Wearing it correctly fastened **doubles the chances of surviving** an accident.

It is important that all passengers fasten their seat belts **before starting the journey with the vehicle stationary**. This ensures that from the very first moment the vehicle begins to move, everyone is protected. Fastening the seat belt during the journey or at the end does not provide the necessary protection in the event of a sudden accident.

Additionally, the seat belt must be properly adjusted to the body, with the **shoulder strap** passing over the collarbone and the center of the chest, and the **lap belt** over the hip bones. This ensures that the seat belt functions correctly and minimizes the risk of injury in the event of an impact.

Therefore, to ensure the safety of all occupants, it is essential that they fasten their seat belts **before the vehicle begins to move**.