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Difficulty: MediumWinter Driving, Snow, and Black Ice

While driving on a highway covered with packed snow, the ambient temperature rises slightly to 32°F (0°C) and the road surface appears wet and dark. Which of the following actions is the safest driving practice under these conditions?

  1. Increase following distance significantly and reduce speed gradually without sharp steering inputs.Answer
  2. B
    Maintain the posted speed limit as long as visibility remains clear.
  3. C
    Maintain a standard three-second following distance to avoid disrupting traffic flow.
  4. D
    Apply firm and rapid braking if the vehicle starts to drift slightly.

Answer

Increase following distance significantly and reduce speed gradually without sharp steering inputs.
The correct option highlights increasing following distance while making smooth, gradual speed and steering adjustments. Temperatures near 32°F (0°C) create dangerously slick conditions, especially when black ice forms. Smooth inputs prevent loss of tire grip, and extra distance accounts for substantially increased stopping distances.

Step-by-Step Solution

1
Identify environmental hazards present in the driving environment.
Temperatures around 32°F (0°C) combined with dark, wet-looking pavement indicate black ice and severely reduced tire traction.
Ice near the freezing point is extremely slick because a thin layer of liquid water forms on top of the ice.
2
Determine the necessary speed and spatial adjustments for hazardous weather.
Speed must be lowered below the posted limit and following distance increased to 8 to 10 seconds.
The Basic Speed Law requires driving at a safe speed for existing conditions, and stopping distances on ice are greatly extended.
3
Evaluate control inputs required to prevent loss of vehicle stability.
Gradual speed reduction and smooth steering without hard braking preserve existing tire grip.
Abrupt braking or steering forces easily exceed available friction on frozen road surfaces.

Key Concept

Basic Speed Law and traction management on icy road surfaces
Estimated Time:1m 0s
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Topics

Winter Driving, Snow, and Black Ice

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