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Difficulty: EasyDriving in Fog

When encountering dense fog on a rural roadway, which of the following is the proper procedure for maintaining safe vehicle operation?

  1. A
    Switch to high-beam headlights to cut through the moisture particles ahead
  2. Use low-beam headlights and adjust vehicle speed to be able to stop within visible distanceAnswer
  3. C
    Turn on the engine retarder to full power to control speed without illuminating brake lights
  4. D
    Follow closely behind the taillights of a lead vehicle to stay centered in the travel lane

Answer

Use low-beam headlights and adjust vehicle speed to be able to stop within visible distance
According to official CDL safety guidelines, driving in fog requires using low-beam headlights (along with clearance lights) and reducing speed so the vehicle can always stop within the clear distance seen ahead.

Step-by-Step Solution

1
Select appropriate lighting for adverse atmospheric conditions
Low-beam headlights illuminate the immediate roadway while minimizing glare reflection from suspended fog droplets
High-beam lights reflect off fog particles directly into the driver's eyes, blinding the operator.
2
Regulate vehicle speed relative to forward sight distance
Total stopping distance remains shorter than the visible distance ahead
Safe CDL operation requires being able to come to a complete stop within the clear space visible ahead.

Key Concept

Low-beam headlight selection and sight-distance speed management in fog
Estimated Time:45s
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Topics

Driving in Fog

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