How should a vehicle's mirror be adjusted?

The correct adjustment of a vehicle's mirror is essential for safe driving and ensures that the driver has a clear view of what is behind. By positioning the mirror to provide an unobstructed view of the area directly behind the vehicle, the driver can effectively monitor traffic and any obstacles, which is crucial for maneuvers such as reversing or changing lanes. This adjustment helps in minimizing blind spots and enhances overall awareness of the surroundings.

Ensuring a clear view of the face, front lane, or other vehicles does not serve the primary function of the rearview mirror, which is to provide visibility behind the vehicle for safe driving practices. Thus, adjusting the mirror to achieve a clear view of its behind stands out as the most critical and relevant choice for ensuring proper driving safety.