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Question

Difficulty: MediumWinter Driving

While traveling on a highway during sub-freezing weather, you notice that water spray thrown off by the tires of preceding vehicles has stopped, even though the road surface still appears wet and shiny. What condition does this signify, and how should you adjust your vehicle operation?

  1. A
    The road is drying out; maintain current cruising speed and activate engine retarders to assist in deceleration.
  2. The roadway has frozen into black ice; ease off the accelerator, ensure auxiliary engine retarders remain off, and reduce speed gradually without harsh braking.Answer
  3. C
    Hydroplaning danger has passed; continue at the posted speed limit while maintaining standard dry-pavement following distance.
  4. D
    Pavement friction remains adequate; apply firm test brake applications to check tire grip and establish stopping requirements.

Answer

The cessation of tire spray on wet-looking pavement in sub-freezing temperatures indicates that black ice has formed; the driver must smoothly ease off the accelerator, keep engine retarders turned off, and decelerate gradually without sudden steering or braking inputs.
When ambient temperatures are near or below freezing and the road looks wet but passing vehicles stop kicking up water spray, the moisture on the pavement has frozen into a thin, transparent sheet of black ice. According to CDL safety standards, drivers must immediately recognize this severe traction loss, ensure engine retarders are turned off to avoid drive-wheel lockup, avoid hard braking or sharp steering, and gradually reduce road speed.

Step-by-Step Solution

1
Analyze the environmental and visual clues described in the scenario.
Identified that sub-freezing temperatures combined with wet-looking pavement and an absence of tire spray indicate black ice.
When standing water freezes into ice, vehicles no longer throw water spray into the air, creating a false visual impression of a wet roadway.
2
Determine the necessary vehicle control adjustments for ice-covered pavement.
Disengage auxiliary engine retarders, ease off the throttle smoothly, and avoid abrupt steering or hard braking.
Commercial driver safety manuals mandate turning off engine retarders on slippery surfaces to prevent drive-wheel lockup and jackknife skids, while speed must be reduced to a crawl on ice.

Key Concept

Recognition of black ice indicators and correct speed, throttle, and retarder management under slippery winter conditions.
Estimated Time:1m 0s
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Topics

Winter Driving

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