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Question

Difficulty: EasySpeed and Road Conditions

A delivery driver is operating a commercial vehicle on a rural route when encountering a roadway covered in packed snow. According to standard commercial driver licensing safety guidelines, how should the driver adjust vehicle speed for this surface condition?

  1. A
    Maintain cruising speed on straightaways and brake firmly once entering slippery curves.
  2. Reduce speed by half or more of the normal dry-road speed.Answer
  3. C
    Reduce speed by only one-third while engaging the engine retarder to maximize braking traction.
  4. D
    Maintain normal posted speed because modern commercial air brakes automatically offset reduced surface traction.

Answer

Reduce speed by half or more of the normal dry-road speed.
According to standard commercial driving manuals, drivers must adjust speed according to road conditions: reduce speed by about 1/3 on wet pavement, by 1/2 or more on packed snow, and down to a crawl on ice.

Step-by-Step Solution

1
Identify the roadway surface condition and recall the corresponding CDL speed reduction standard.
The roadway is covered in packed snow, which significantly diminishes tire traction compared to dry pavement.
Commercial driver regulations define explicit speed reduction benchmarks for specific adverse road conditions.
2
Apply the speed adjustment rule for packed snow.
The driver must slow the vehicle down by at least 1/2 (half or more) of the normal dry-road operating speed.
Cutting speed by half or more compensates for drastically increased braking distance and reduced steering control on snow.

Key Concept

Speed adjustment guidelines on slippery surfaces (packed snow)
Estimated Time:45s
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Topics

Speed and Road Conditions

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