What should you check to confirm that no vehicles are approaching from behind before changing lanes?

To ensure safety while changing lanes, it is crucial to check your mirrors. This action allows you to observe vehicles approaching from behind, including those in your blind spots. By using your mirrors effectively, you can gauge the distance and speed of any vehicles that may be behind you, which is vital information for making a safe lane change.

Your gauges monitor the vehicle's performance and status, but they do not provide information about surrounding traffic. A GPS system helps with navigation but does not assist in checking for nearby vehicles. Headlights are important for visibility but do not contribute to understanding lane change safety by indicating surrounding traffic. Therefore, checking your mirrors is the essential step for confirming that no vehicles are approaching from behind before making a lane change.