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Difficulty: MediumDriving in Fog and Reduced Visibility

While driving on a rural highway, you enter a dense fog bank that drastically reduces visibility to less than 200 feet. Which of the following actions should you take to drive safely under these conditions?

  1. A
    Turn on your high-beam headlights and maintain the posted speed limit to pass through the fog bank as quickly as possible.
  2. Switch to low-beam headlights, slow down below the posted speed limit, and increase your following distance behind the vehicle ahead.Answer
  3. C
    Turn on your high-beam headlights while decreasing your following distance so you do not lose sight of the vehicle in front of you.
  4. D
    Turn off all vehicle exterior lights and track the center yellow pavement line to stay in your lane.

Answer

Switch to low-beam headlights, slow down below the posted speed limit, and increase your following distance behind the vehicle ahead.
The correct safety response in fog is to use low-beam headlights (or fog lights), reduce speed according to the Basic Speed Law, and expand following distance to allow adequate reaction time.

Step-by-Step Solution

1
Assess environmental visibility and lighting requirements
Identify that dense fog reduces visibility, requiring low-beam headlights (or fog lights) rather than high beams.
High-beam lights reflect off airborne water droplets directly into the driver's eyes, creating visual glare.
2
Apply the Basic Speed Law
Reduce vehicle speed below the posted maximum speed limit to suit current road conditions.
The Basic Speed Law mandates driving at a safe speed for existing conditions regardless of posted numerical limits.
3
Adjust spatial safety buffer zone
Increase following distance from the standard 3-4 seconds to a larger gap.
Lower visibility requires more time and space to perceive and react to potential hazards ahead.

Key Concept

Low-beam headlight usage and speed adjustment under Basic Speed Law in reduced visibility conditions
Estimated Time:1m 0s
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Topics

Driving in Fog and Reduced Visibility

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