Headlights must be used when you cannot see a pedestrian 500 feet ahead.

• A. Use headlights only at night
• B. Use headlights if you can't see a pedestrian 500 feet ahead
• C. Use headlights when visibility is poor even if you can see pedestrians
• D. Headlights are optional during daylight

Answer: (B)

Headlights should be used whenever visibility is poor enough that you cannot see objects 500 feet ahead. This rule helps you detect pedestrians in time and makes your car more visible to others. If you can’t spot a pedestrian 500 feet away, turning on headlights improves your ability to see them and signals your presence to oncoming traffic and other road users. The idea isn’t limited to nighttime and isn’t about using headlights only when you can’t see someone at any distance or making it optional during daylight; those options don’t align with the safety guideline expressed by the 500-foot visibility threshold.