What is the main value of making a head check to the left or right before changing lanes?

What is the main value of making a head check to the left or right before changing lanes?

• A. To see the color of traffic lights.
• B. To look for pedestrians only.
• C. To check yourself in the mirror.
• D. To check for vehicles in blind spots.

Answer: (D)

The main value of a head check before changing lanes is to reveal vehicles in your blind spots. Your side and rear mirrors can’t show everything beside and just behind you, especially in the lane you’re moving into. By turning your head briefly to look over your shoulder, you confirm that there isn’t a car, motorcycle, or other vehicle in that space and that it’s safe to move. This head check works with mirrors as part of a complete lane-change check, but the key purpose is to detect those hidden vehicles that mirrors can miss. The other ideas—watching for traffic lights or pedestrians, or just checking your own reflection—don’t address the real safety need when shifting lanes.

The main value of a head check before changing lanes is to reveal vehicles in your blind spots. Your side and rear mirrors can’t show everything beside and just behind you, especially in the lane you’re moving into. By turning your head briefly to look over your shoulder, you confirm that there isn’t a car, motorcycle, or other vehicle in that space and that it’s safe to move. This head check works with mirrors as part of a complete lane-change check, but the key purpose is to detect those hidden vehicles that mirrors can miss. The other ideas—watching for traffic lights or pedestrians, or just checking your own reflection—don’t address the real safety need when shifting lanes.