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Question

Difficulty: EasyWinter Driving, Snow, and Black Ice

Why are shaded road sections particularly hazardous when temperatures are near freezing during winter driving?

  1. Ice forms on shaded surfaces earlier and melts more slowly than on unshaded areas.Answer
  2. B
    Drivers are expected to maintain the posted speed limit regardless of shaded road ice.
  3. C
    Shaded roadways cause immediate tire pressure loss that leads to rapid tread separation.
  4. D
    Following distance should be reduced to two seconds to clear the shaded area as quickly as possible.

Answer

Ice forms on shaded surfaces earlier and melts more slowly than on unshaded areas.
Shaded road sections receive limited sunlight, causing water and packed snow to freeze earlier and linger longer than on surrounding unshaded roadways.

Step-by-Step Solution

1
Identify environmental conditions affecting pavement temperature.
Shaded road sections receive significantly less radiant heat from sunlight compared to exposed pavement.
Surrounding trees, buildings, or hills block direct sunlight.
2
Determine the impact of lower pavement temperatures on ice formation.
Moisture on shaded surfaces freezes at higher ambient temperatures and remains icy long after open roads have dried.
Cold pavement preserves ice and frost even when surrounding temperatures rise slightly above freezing.

Key Concept

Shaded Road Surface Hazards in Winter
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Topics

Winter Driving, Snow, and Black Ice

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