If you are riding in rain and fog, you should
- turn on your low beam. ✓
- turn on your high beam.
- leave your lights on as usual.
- None of the above.
Answer: A. turn on your low beam.
When you ride in rain and fog, turn on your low beam headlight.
Why this is the answer
The handbook says to use the low beam in fog or heavy rain, especially at night, because it gives you better vision. It warns against the high beam in these conditions: the light bounces off the rain or fog and creates glare. The rain and fog strategies also say to use the low beam when visibility is limited, so oncoming traffic can see you and you can see more clearly. Leaving your lights as they are does not follow this guidance for reduced visibility.
Why the other answers are wrong
- B. turn on your high beam. — The high beam reflects off the rain or fog and causes glare, which makes your vision worse instead of better.
- C. leave your lights on as usual. — Simply leaving your lights as usual ignores the handbook's instruction to switch to the low beam when visibility is limited by rain or fog.
- D. None of the above. — The handbook does give a specific action for rain and fog, so saying none of the listed choices is wrong.
Remember it
Think of fog and rain as a mirror: the low beam stays under the glare, the high beam bounces back in your eyes.