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Difficulty: MediumDriving in Fog

A freight truck encounters dense patches of fog near a river basin, which significantly reduces forward sight distance and coats the asphalt with condensation. What should the driver do to safely navigate these conditions?

  1. A
    Follow the taillights of the vehicle ahead closely to guide lane positioning while using high-beam headlights to maximize forward illumination.
  2. Reduce speed to be able to stop within the visible distance ahead, use low-beam headlights, and switch off auxiliary engine brakes on the slick pavement.Answer
  3. C
    Keep the auxiliary engine brake engaged at its highest setting to maintain rapid slowing capability across the damp roadway surface.
  4. D
    Maintain normal cruising speed under the assumption that vehicle braking distance accounts for stopping needs without factoring in perception and reaction distances.

Answer

Reduce speed to be able to stop within the visible distance ahead, use low-beam headlights, and switch off auxiliary engine brakes on the slick pavement.
The correct answer emphasizes matching vehicle speed to the available sight distance, utilizing low-beam headlights to eliminate blinding back-scatter glare from moisture droplets, and turning off auxiliary engine retarders to prevent dangerous drive-wheel skidding on damp pavement.

Step-by-Step Solution

1
Assess the visibility and road surface conditions
Identify restricted sight distance and moisture accumulation on the pavement surface.
Fog restricts forward vision and simultaneously creates slick road conditions from condensation.
2
Select appropriate vehicle lighting and speed management
Engage low-beam headlights and reduce operating speed so total stopping distance does not exceed sight distance.
High beams cause blinding glare by reflecting off water droplets, while excessive speed prevents stopping before an unseen hazard.
3
Adjust auxiliary vehicle braking systems for slippery pavement
Turn off engine retarders and auxiliary braking devices.
Retarder application on wet surfaces can lock drive axles and provoke an immediate drive-wheel skid.

Key Concept

Defensive speed, lighting, and braking management in fog
Estimated Time:1m 0s
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Topics

Driving in Fog

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