Headlamp adjustment can include UP and DOWN and LEFT and RIGHT adjustments. Which option best describes this capability?

• A. UP/DOWN only
• B. LEFT/RIGHT only
• C. Both UP/DOWN and LEFT/RIGHT
• D. None of the above

Answer: (C)

Headlamp aiming is about adjusting the beam in both vertical and horizontal planes. The vertical adjustment lets you raise or lower the beam to keep it aimed at the road and avoid blinding oncoming drivers, while the horizontal adjustment moves the beam left or right so it aligns with the lane center. Many headlight assemblies provide both a vertical and a horizontal adjustment mechanism, so describing the capability as including both UP/DOWN and LEFT/RIGHT accurately captures how headlamps can be aimed. If only one axis could be adjusted, proper alignment wouldn’t be possible, which is why the best answer recognizes both directions.