Which of the following actions is considered unsafe when driving?

Checking your GPS while driving is recognized as an unsafe action because it diverts your attention from the primary task of driving. Engaging with GPS navigation requires mental focus and can lead to visual distractions, both of which significantly increase the risk of an accident. Maintaining full attention on the road is crucial for safe driving; therefore, drivers should plan their routes and set their GPS before starting their journey or pull over safely to make adjustments, rather than while in motion.

In contrast, adjusting your mirrors before driving is a necessary step to ensure proper visibility. Using a hands-free device allows you to communicate without taking your hands off the wheel, thus minimizing physical distraction. Familiarizing yourself with road signs is vital for understanding traffic regulations and ensuring safe navigation on the roads. Therefore, while these other options contribute to safer driving practices, checking the GPS while driving compromises your attention on the road.