The **driver** is responsible for ensuring that passengers maintain an appropriate position for safety in the vehicle. This is due to several reasons:

- **Passenger and load distribution**: The driver must ensure that passengers are correctly distributed in their seats and do not move during the journey. Additionally, the load must be placed in a way that does not interfere with the driver's ability to drive and see the road. This is crucial to maintaining a safe environment inside the vehicle.

- **Use of seat belts**: All occupants of a vehicle must have their seat belts fastened, and it is the driver's responsibility to ensure this is adhered to. Although there are some exceptions, it is recommended that all passengers always use them to maximize safety.

- **Vehicle adjustments**: Before starting to drive, the driver must ensure that the seat, backrest, and mirrors are properly adjusted. This is important not only for their own comfort and safety but also to ensure they can adequately supervise the passengers and the vehicle's surroundings.

In summary, the driver has the responsibility to supervise and ensure that all passengers are in a safe position and that the vehicle is adequately prepared for the journey.