What is the purpose of the rearview mirrors on a motorcycle?

The purpose of the rearview mirrors on a motorcycle is to monitor traffic behind you. Rearview mirrors are essential for providing visibility of the road situation behind the rider, which is crucial for safe riding. By regularly checking these mirrors, a motorcyclist can be aware of vehicles approaching from behind, allowing for informed decisions about lane changes, turns, or any necessary evasive actions. This helps to enhance overall safety on the road, as being aware of what's happening behind contributes to better situational awareness.

The other options do not pertain to the primary function of rearview mirrors. Adjusting the seat position is related to comfort and control but does not involve the mirrors. Checking tire pressure is a maintenance task that should be done separately, and enhancing road grip is influenced by tire design and surface conditions rather than mirror use.