What is the main function of the rearview mirror?

The main function of the rearview mirror is to provide a view of the traffic behind you. This mirror allows the driver to see what is directly behind the vehicle, helping monitor the position and movements of vehicles and other road users that are approaching from the rear. This visibility is crucial for safe driving practices, particularly when changing lanes, merging, or preparing to make a turn.

While checking blind spots is an important part of driving, that typically requires the use of side mirrors, not the rearview mirror. Similarly, while the rearview mirror can aid in parking, especially in ensuring that there is clear space behind the vehicle, its primary purpose is related to the traffic behind. Monitoring dashboard controls is also not a function of the rearview mirror, as those controls are positioned in the vehicle's cabin and do not involve the mirror.