What is the main value of performing a head-check before changing lanes?

• A. It covers areas not visible by rear-view mirrors
• B. It saves fuel
• C. It saves time
• D. It reduces reaction distance

Answer: (A)

Before changing lanes, turning your head to look over your shoulder helps you see areas your mirrors can’t show. Mirrors have blind spots—spaces beside and just behind your car that can hide other vehicles. A quick head-turn gives you a real-time view of those spots, letting you confirm the lane is truly clear before you move. This simple check is what prevents side-swipe crashes that could happen even when the road looks clear in the mirrors. It’s not about saving fuel or time, and it doesn’t change how far you must react if a hazard appears; it’s about actually seeing the space you’re about to enter so you can change lanes safely.