When should you check your mirrors?

Answer: B — Every time you change lanes or turn

Checking your mirrors every time you change lanes or turn is crucial for maintaining awareness of your surroundings and ensuring safety on the road. This practice allows you to monitor the position and movement of other vehicles, cyclists, and pedestrians near your vehicle, which is essential for making informed driving decisions. Frequent mirror checks help prevent accidents by allowing you to see potential hazards that may not be immediately in your line of sight, particularly when maneuvering your vehicle. It is a fundamental part of responsible driving that promotes defensive driving habits. The other options fail to recognize the ongoing need for situational awareness while driving. Checking mirrors only at the beginning of a trip or solely in heavy traffic limits your ability to react to sudden changes in your environment, and checking them just once when starting to drive neglects the importance of continuous vigilance on the road.