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Difficulty: HardDriving in Fog and Reduced Visibility

You are driving on a rural two-lane highway at 55 mph when a dense fog bank suddenly drops forward sight distance to under 80 feet. Vehicles are traveling both ahead of and behind you. Under official traffic safety rules and basic speed law, which sequence of actions should you take?

  1. Gradually reduce your speed so you can stop within your visible sight distance, ensure your low-beam headlights are on, and use the right pavement edge line for steering guidance.Answer
  2. B
    Maintain 55 mph to prevent rear-end collisions from vehicles behind you, while activating high-beam headlights to cut through the thick fog.
  3. C
    Decrease your following distance behind the vehicle ahead to less than one second so you can closely track their rear lights through the fog bank.
  4. D
    Switch on high-beam headlights and guide your vehicle by focusing directly on the yellow center line to prevent drifting off the left shoulder.

Answer

Gradually reduce your speed so you can stop within your visible sight distance, ensure your low-beam headlights are on, and use the right pavement edge line for steering guidance.
When driving in dense fog with visibility reduced to under 80 feet, legal safety rules require reducing speed to allow stopping within sight distance, using low-beam headlights to minimize glare, and watching the right edge line (fog line) to stay safely in lane.

Step-by-Step Solution

1
Assess the visibility hazard and apply the Basic Speed Law
Determine that driving at 55 mph with less than 80 feet of sight distance is unsafe
The Basic Speed Law dictates that you must never drive faster than is safe for current visibility and road conditions, regardless of the posted limit.
2
Select proper vehicle lighting
Use low-beam headlights rather than high-beam headlights
High-beam light bounces off moisture particles in fog, causing blinding reflection back toward the driver. Low beams project light downward onto the roadway surface.
3
Establish visual reference points and safe space buffer
Track the right edge line (fog line) and maintain an expanded following distance
Using the right edge line keeps your vehicle safely in its lane without steering into oncoming traffic or staring into oncoming headlight glare.

Key Concept

Driving in fog requires slowing down according to the Basic Speed Law, utilizing low-beam headlights to eliminate glare, increasing following distance, and referencing the right fog line.
Estimated Time:1m 30s
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Topics

Driving in Fog and Reduced Visibility

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