When must you turn on headlights after sunset?

• A. At sunset
• B. Within 30 minutes after sunset
• C. After sunrise
• D. When raining

Answer: (B)

The main idea here is when you must turn on your headlights after daylight ends. Once the sun has set, visibility drops and you need lights so you can see the road and be seen by others. Turning them on within 30 minutes after sunset ensures you’re illuminated as evening turns to night, which is the common legal requirement to use headlights during that darker period. This timing covers dusk-to-night driving and helps prevent crashes as light levels fall.

Raining doesn’t determine this timing, and headlights are not required specifically because of rain in this rule. Sunrise is the opposite situation, when daylight is returning, so headlights aren’t required then. Turning them on exactly at sunset isn’t as precise as the window after sunset; the rule is to switch them on within 30 minutes after sunset.