Before starting to drive, it is essential to **check the adjustment of the rearview mirrors**. This should be done on a **flat and straight surface** to ensure that the mirrors are properly positioned and offer the best possible visibility.

- **Properly positioned mirrors**: When adjusting the mirrors, you should ensure that when looking at the interior rearview mirror, you can see all four edges of the rear window. In the side mirrors, you should be able to see the road, the vehicles coming from behind, and those on the sides. Additionally, by slightly turning your neck, you should see a part of the rear of your vehicle.


- **Importance of visibility**: Mirrors are essential for seeing what is happening behind and to the sides of the vehicle. During the journey, it is necessary to look at them regularly to maintain safe driving. However, if the mirrors are not properly adjusted from the start, you could have blind spots that increase the risk of accidents.

- **Correction of errors**: If you discover that the mirrors are poorly adjusted while driving, you should stop the vehicle in a safe, flat, and straight place to correct them. This ensures that you can see properly and react in time to any situation on the road.

For these reasons, it is crucial to adjust the rearview mirrors **before starting the journey** to ensure safe and efficient driving.