If you need to drive in foggy weather:
- Turn on your low beam headlights. ✓
- Turn on your hazard lights.
- It is okay to drive at the maximum speed limit.
- Do not drive at a speed above 10 miles per hour.
Answer: A. Turn on your low beam headlights.
Turn on your low beam headlights when you need to drive in fog.
Why this is the answer
The Texas handbook puts fog on the list of conditions that call for low beam headlights. It also warns against overdriving your headlights and says low beams have a stopping-distance limit, so you need to be able to stop within the distance they light. That makes low beams the handbook's listed choice for fog, rather than a higher speed or hazard lights.
Why the other answers are wrong
- B. Turn on your hazard lights. — The handbook does not list hazard lights for fog; it lists low beam headlights.
- C. It is okay to drive at the maximum speed limit. — The passages do not support driving at the maximum speed limit in fog; they point you to low beams and warn about driving faster than your headlights let you stop.
- D. Do not drive at a speed above 10 miles per hour. — No passage sets a 10 miles per hour cap for fog; that number is not in the handbook text provided.
Remember it
Fog goes with low beams: keep the light down and aimed at the road.
Official handbook: Texas Driver Handbook (DL-7), Chapter 8: Speed and Speed Limits , p. 47