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Question

Difficulty: MediumWinter Driving

While operating a commercial motor vehicle on a highway where the pavement is covered with packed snow, what speed adjustment should you make according to CDL safety guidelines?

  1. A
    Maintain normal highway speed while engaging the engine retarder on its highest setting to assist braking.
  2. Reduce your vehicle speed by at least one-third.Answer
  3. C
    Reduce your speed by only 5 mph while maintaining standard dry-road following distance.
  4. D
    Maintain posted speed limits provided that steer tire tread depths meet the minimum 2/32-inch standard.

Answer

Reduce your vehicle speed by at least one-third.
On packed snow, commercial vehicle drivers must reduce their speed by at least one-third to compensate for reduced friction and maintain safe stopping capability.

Step-by-Step Solution

1
Identify the roadway condition and traction hazard.
The roadway surface is covered with packed snow, which significantly reduces the friction coefficient between the tires and the road.
Slippery road surfaces drastically increase stopping distance and the likelihood of skidding under regular travel speeds.
2
Apply the standard commercial driving speed adjustment rule for packed snow.
Speed must be reduced by at least one-third (e.g., from 60 mph down to 40 mph or slower).
The official CDL manual establishes a one-third speed reduction on packed snow and slowing to a crawl on ice to ensure vehicle control.

Key Concept

Speed management and vehicle control on packed snow
Estimated Time:1m 0s
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Topics

Winter Driving

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