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Difficulty: MediumDriving in Fog and Reduced Visibility

While driving on a highway during reduced visibility caused by thick fog, a driver suddenly loses sight of the vehicle ahead. Which of the following is the safest and legally compliant action for the driver to take?

  1. Reduce speed to ensure the vehicle can stop within the visible distance ahead, and use the right edge line of the roadway as a visual guide.Answer
  2. B
    Increase speed slightly to re-establish sight of the lead vehicle's taillights so they can be followed through the fog.
  3. C
    Switch to high-beam headlights to project light farther into the fog bank ahead.
  4. D
    Maintain the posted speed limit while activating hazard flasher lights to warn following traffic.

Answer

Reduce speed to ensure the vehicle can stop within the visible distance ahead, and use the right edge line of the roadway as a visual guide.
When thick fog limits vision, safety requires reducing speed so the vehicle can come to a complete stop within the visible distance ahead. Tracking the white painted line on the right edge of the roadway provides a stable spatial reference without risking lane drift or reliance on other vehicles.

Step-by-Step Solution

1
Evaluate stopping distance against current visibility.
Determine that driving at normal speeds without clear forward visibility violates safe stopping distance principles.
The Basic Speed Law requires drivers to operate at a speed that is safe for existing weather and visibility conditions.
2
Adjust speed and establish a reliable visual reference.
Slow down and focus on the white pavement marking on the right side of the road while keeping low-beam headlights illuminated.
Low beams minimize reflective glare, and watching the right edge line maintains proper lane positioning without blinding oncoming traffic.

Key Concept

Adjusting speed to visual range and utilizing edge lines during reduced visibility
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Topics

Driving in Fog and Reduced Visibility

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