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Difficulty: MediumDriving in Fog and Reduced Visibility

You are driving along a two-lane road during heavy morning fog that suddenly restricts your forward visibility to under 100 feet. A vehicle ahead of you slows down, and its taillights are barely visible. Which of the following actions is the safest and correct driving response?

  1. Increase your following distance and focus your vision on the right edge line of the road to guide your path.Answer
  2. B
    Activate your high-beam headlights so the stronger light beam cuts through the thick fog moisture.
  3. C
    Close the gap with the vehicle in front so you do not lose sight of its taillights.
  4. D
    Maintain your current speed at the posted speed limit as long as you can still track the vehicle ahead.

Answer

Increase your following distance and focus your vision on the right edge line of the road to guide your path.
The correct action is to drop back to increase your following distance and use the right white edge line of the road as a visual guide. This protects against rear-end crashes and prevents you from accidentally following a drifting vehicle off the road.

Step-by-Step Solution

1
Evaluate the visibility hazard
Recognize that visibility under 100 feet requires immediate speed reduction and extra spatial buffers.
Dense fog dramatically lowers reaction times and hides obstacles.
2
Determine the proper optical reference point and light settings
Use low-beam headlights and look toward the right fog line (painted edge line) of the lane.
Staring directly at the taillights of the car ahead causes visual fatigue, leads to unintended tailgating, and risks following them if they drift off course.
3
Apply the Basic Speed Law and safe following distance principles
Reduce speed below the posted limit and widen following distance.
Stopping distance must be well within the visible clear distance ahead.

Key Concept

Defensive driving practices and visual positioning in dense fog
Estimated Time:1m 0s
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Topics

Driving in Fog and Reduced Visibility

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