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SESK: Stuff Everyone Should Know · sesk.info/cdl-hazardous-conditions-speed

According to federal rules, what must a CDL driver do in snow, ice, fog, or smoke?

Reduce speed to stop safely.

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  1. Reduce speed enough to stop safely ✔
  2. Maintain posted speed
  3. Drive faster to clear the hazard

Why: Federal rules require you to slow down when weather hurts visibility or traction. If conditions get dangerous enough, you must stop driving until it is safe.

Huh, didn't know that: Hazardous conditions include snow, ice, sleet, fog, mist, rain, dust, or smoke.

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What do you call a truck that slows down in snow? Sensible.
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References

Answer: Reduce speed enough to stop safely. Federal rules require you to slow down when weather hurts visibility or traction. If conditions get dangerous enough, you must stop driving until it is safe.

  1. 49 CFR 392.14 (eCFR) www.ecfr.gov/current/title-49/section-392.14
    Speed shall be reduced when such conditions exist.
    Checked 2026-10-10.

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