What is the purpose of motorcycle mirrors?

The primary purpose of motorcycle mirrors is to provide visibility of traffic behind and to the sides. This is crucial for a rider's safety, as it allows them to be aware of their surroundings and other vehicles that may be approaching. Effective use of mirrors enables motorcyclists to make informed decisions regarding lane changes, merging, and navigating high-traffic areas.

The other options do not align with the function of motorcycle mirrors. Adjusting the seat position is related to rider comfort and ergonomics but has no connection to visibility. Enhancing the appearance of the motorcycle is more about aesthetics than safety. Indicating the speed of the motorcycle is the function of the speedometer, not the mirrors. Thus, the correct answer emphasizes the essential role that mirrors play in maintaining awareness and safety on the road.