To ensure **safety** when using the seat belt, it is essential that it is **properly adjusted** to the body, meaning neither too loose nor too tight.

- A **too loose** seat belt can allow the body to slide in the event of an accident, known as the **submarine effect**. This effect occurs when the body slides under the belt, increasing the risk of injury. To avoid this, the belt must be well adjusted and the seat should not be reclined backward.

- On the other hand, a **too tight** seat belt can be uncomfortable and can also cause injuries in the event of an impact. It is important that the belt allows comfortable movement without being loose.

- The **shoulder strap** of the belt should pass over the collarbone, between the shoulder and the neck, and go down the center of the chest. Incorrect placement can reduce its effectiveness and increase the risk of injury.

- The **lap belt** should be over the hip bones, not over the stomach, to avoid internal injuries in the event of an accident.


Therefore, the seat belt should be **neither too loose nor too tight** to provide maximum protection and comfort while driving.