What does a correctly adjusted mirror not allow?

A correctly adjusted mirror primarily focuses on enhancing a driver's visibility and awareness of their surroundings. Specifically, it is designed to minimize blind spots and improve rear visibility, which is vital for safe driving. When mirrors are adjusted correctly, they should effectively allow the driver to see the driver’s side and clearly view the rear.

However, mirrors are not intended for focusing on the interior of the vehicle; they serve the purpose of providing visibility outside. By correctly adjusting the mirrors, drivers can ensure they have a wide field of view of the road and other vehicles, which is crucial for safe maneuvers, changing lanes, and backing up. This function aligns with the critical safety measures emphasized in the Utah Driver Handbook, making it essential for drivers to prioritize external visibility rather than interior observation when positioning their mirrors.