When should you turn on your headlights?

Answer: A — 1 hour after sunset and 1 hour before sunrise

You should turn on your headlights 1 hour after sunset and 1 hour before sunrise. This is the correct answer because visibility is significantly reduced during the times around sunrise and sunset, making it crucial to have your headlights on to make your vehicle more visible to others on the road. Option B, turning on headlights 1/2 hour after sunset and 1/2 hour before sunrise, is not as effective as turning them on earlier. Option C, turning them on 1/4 hour after sunset and 1/4 hour before sunrise, is also not optimal for ensuring visibility in low light conditions. Option D, turning on headlights 1 hour before sunset and 1 hour after sunrise, is incorrect as it suggests having headlights on during daylight hours when they are not required for visibility.