Which of these statements is true about changing lanes?

When changing lanes, it's essential to ensure that the maneuver is safe and that other drivers are aware of your intentions. The correct approach involves checking your blind spots by looking over your shoulders, which allows you to confirm that the lane you're moving into is indeed clear of other vehicles or obstacles.

For a right lane change, you would look over your right shoulder, as that is the direction from which potential traffic might approach. Similarly, when changing to the left lane, looking over your left shoulder helps you spot any vehicles that may be in your blind spot. This practice significantly reduces the risk of collisions, as your mirrors do not provide a complete view of the area surrounding your car.

This perspective emphasizes the importance of direct visual confirmation in addition to using mirrors, which may not always show everything. This is why simply relying on mirrors alone, as suggested in other options, is not sufficient and can lead to unsafe lane changes.