When driving in fog, it is best to drive with:
- High beam headlights.
- Low beam headlights. ✓
- Four-way flashers.
Answer: B. Low beam headlights.
When driving in fog, use low-beam headlights.
Why this is the answer
The handbook says that in heavy fog or smoke you should drive slowly and use your low-beam headlights. It explains that high beams reflect back and cause glare, which makes it harder to see. The same section says that if the fog becomes too thick to drive safely, you should pull off the road, activate your emergency flashers, and wait for conditions to improve. That means flashers are for when you are stopped, not for normal driving in fog.
Why the other answers are wrong
- A. High beam headlights. — High-beam headlights reflect back in fog and cause glare, making it harder to see.
- C. Four-way flashers. — The handbook mentions emergency flashers only for pulling off the road when fog is too thick to drive safely, not for use while driving in fog.
Remember it
In fog, keep the beam low so the light does not bounce back at you.
Official handbook: California Driver Handbook (DL 600), Section 8: Safe Driving, p. 64