SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cdl-fog-low-beams

Which headlight setting should a CDL driver use in fog?

Use low beams in fog.

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  1. High beams
  2. Low beams ✔
  3. Parking lights

Why: Low beams and fog lights give the best visibility in fog, even in daytime. The manual's best advice is to wait out fog at a rest area if you can.

Huh, didn't know that: Slow down before you enter fog and turn on your 4-way flashers.

The dad joke
What did the fog say to the high beams? You are reflecting on me.
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References

Answer: Low beams. Low beams and fog lights give the best visibility in fog, even in daytime. The manual's best advice is to wait out fog at a rest area if you can.

  1. California Commercial Driver Handbook (AAMVA model manual) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    Use low-beam headlights and fog lights for best visibility even in daytime
    Checked 2026-10-10.

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