What is one primary reason to adjust mirrors before starting your vehicle?

Adjusting mirrors before starting your vehicle is primarily intended to ensure maximum visibility of your surroundings. Properly positioned mirrors provide the driver with a clear view of what is behind and alongside the vehicle, significantly enhancing situational awareness. This is crucial for safe driving, as it allows you to detect other vehicles, pedestrians, and various obstacles that may be in your path, especially when changing lanes or reversing.

While factors like glare from sunlight, cleanliness of mirrors, and GPS navigation assistance can influence driving comfort or utility, they do not directly contribute to the fundamental need for comprehensive visibility while driving. Ensuring mirrors are correctly adjusted prioritizes safety and helps prevent accidents by providing the driver with essential information about the external environment.