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Question

Difficulty: EasySpeed and Road Conditions

Commercial drivers must adjust their operating speed according to varying roadway traction levels. Match each road surface condition with its required speed adjustment rule as specified in commercial driving safety standards. Which pairing correctly links each road condition to its corresponding speed reduction guideline?

  • Wet pavementReduce speed by about one-third (1/31/3)
  • Packed snowReduce speed by one-half (1/21/2) or more
  • Icy road surfaceReduce speed to a crawl and stop driving as soon as safely possible

Answer

Wet pavement pairs with reducing speed by about one-third; packed snow pairs with reducing speed by one-half or more; icy road surface pairs with reducing speed to a crawl and stopping as soon as safely possible.
Standard commercial driving safety rules establish clear proportional speed reductions to maintain safety margins: wet conditions require a one-third speed reduction, packed snow requires slowing by at least one-half, and ice requires slowing to a crawl until the vehicle can safely stop.

Step-by-Step Solution

1
Identify the traction characteristics and standard speed reduction rule for wet pavement.
Wet roads reduce tire friction, requiring a speed reduction of approximately one-third.
Prevents loss of traction and hydroplaning while accounting for longer stopping distances.
2
Identify the standard speed reduction rule for packed snow.
Packed snow creates a slick surface, requiring a speed reduction of one-half or more.
Stopping distance on packed snow can be more than double that on dry pavement.
3
Identify the standard speed reduction rule for icy road conditions.
Ice presents near-zero traction, requiring reducing speed to a crawl and stopping as soon as safe.
Steering and braking capabilities are severely degraded, making standard driving speeds hazardous.

Key Concept

Commercial driver speed adjustments based on road surface traction limits
Estimated Time:45s
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Topics

Speed and Road Conditions

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