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Question

Difficulty: EasySpeed and Road Conditions

A commercial motor vehicle driver is traveling on a roadway covered in packed snow. According to commercial driving safety standards, how should the driver adjust vehicle speed for this surface condition?

  1. A
    Maintain normal highway speed on straight roadways and brake firmly after entering curves
  2. Reduce speed by half or moreAnswer
  3. C
    Reduce speed by about one-third and engage the engine retarder to assist traction
  4. D
    Maintain posted travel speed because total stopping distance depends solely on vehicle braking force

Answer

Reduce speed by half or more.
Official commercial driving safety rules require drivers to reduce speed by about one-third on wet roads, by half or more on packed snow, and to slow down to a crawl on ice. Therefore, operating on packed snow necessitates reducing vehicle speed by half or more.

Step-by-Step Solution

1
Identify the specific road surface condition described in the scenario.
The road surface is covered with packed snow.
Commercial driver regulations prescribe exact speed reduction proportions based on the specific surface condition encountered.
2
Apply the commercial vehicle speed adjustment standard for packed snow.
The driver must reduce speed by half or more.
Packed snow severely reduces tire grip, dramatically lengthening stopping distance and increasing skid probability.

Key Concept

Standard commercial vehicle speed reduction requirements for compromised and slippery road surfaces.
Estimated Time:45s
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Topics

Speed and Road Conditions

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