When should you switch from high beams to low beams?

• A. When you want to save energy
• B. Only at dawn
• C. When you are parking
• D. When another vehicle approaches

Answer: (D)

High beams are meant for very dark, empty roads to maximize forward visibility, but they can blind other drivers. The safest and most appropriate rule is to switch to low beams as soon as another vehicle comes into view or you’re following another vehicle closely. This keeps you able to see the road ahead while avoiding glare that could impair the other driver's vision. The other options aren’t about appropriate headlight use in traffic: high beams aren’t for saving energy, dawn isn’t a reliable trigger, and parking isn’t the situation where you’d need to switch your headlights.