In fog, day or night, a driver should reduce speed and use
- low beam lights ✓
- high beam lights
- hazard flashers
- parking lights
Answer: A. low beam lights
In fog, day or night, reduce your speed and use low beam lights.
Why this is the answer
The handbook limits high beam use to unlit roads at night when no vehicle is approaching or in front of you, so high beam is not the setting for fog. It also says parking lights are for when you are stopped and want to be seen, not for driving; when moving, use the headlights. Daytime running lights are ruled out for low visibility conditions because they do not turn on the tail lights. That leaves low beam headlights as the supported choice when visibility is poor.
Why the other answers are wrong
- B. high beam lights — High beam lights are restricted in the handbook to unlit roads at night with no approaching or front vehicle, so they are not the choice for fog.
- C. hazard flashers — Hazard flashers are not mentioned in the passages as a fog-driving light choice, and the handbook's light guidance points you to headlights when the vehicle is moving.
- D. parking lights — Parking lights are described for use when you are stopped to stay visible, and the handbook says not to use them while moving—put the headlights on instead.
Remember it
Think low and slow in fog: low beams on, high beams saved for dark, empty roads.