You should turn on your headlights:
- One half hour after sunset. ✓
- When stopped at a railroad crossing.
- When parked at a school.
Answer: A. One half hour after sunset.
Turn on your headlights beginning 30 minutes after sunset.
Why this is the answer
The handbook's list of times to use headlights includes beginning 30 minutes after sunset and continuing until 30 minutes before sunrise. That makes the half-hour mark after sunset a listed time to switch them on. The same passage also explains that headlights help you see ahead and help other drivers see your vehicle, but the specific timing rule for this question is the after-sunset threshold. The passage does not connect a railroad crossing stop or school parking to turning on headlights.
Why the other answers are wrong
- B. When stopped at a railroad crossing. — Stopping at a railroad crossing is not one of the handbook's listed times to turn on headlights; its list covers darkness, sunset, weather, tunnels, mountain roads, signs, and low sun.
- C. When parked at a school. — Parking at a school is not listed in the passage as a reason to turn on headlights.
Remember it
Remember sunset plus thirty: that is when the headlight rule starts.