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Difficulty: MediumDriving in Adverse Weather and Low Visibility

You are driving on a highway during late autumn when the ambient temperature drops to near freezing (32∘F32^\circ\text{F} / 0∘F0^\circ\text{F}). As you approach an elevated bridge deck while experiencing light precipitation, which action should you take to safely navigate this road section?

  1. Slow down before reaching the bridge, as elevated structures freeze faster than standard road surfaces due to air circulation above and below.Answer
  2. B
    Maintain the posted numerical speed limit as long as the ground-supported roadway leading up to the bridge remains clear of ice.
  3. C
    Apply the brakes firmly while crossing the bridge deck to ensure maximum tire grip on wet concrete.
  4. D
    Steer sharply to the outer shoulder if you feel the vehicle begin to slide while crossing the bridge deck.

Answer

Reduce vehicle speed before driving onto the bridge because elevated structures freeze earlier than ground-level roadways owing to cold air airflow both above and beneath the bridge deck.
Elevated bridge decks and overpasses freeze first during freezing rain or near-freezing conditions because cold air circulates underneath as well as over the road surface. Drivers must reduce speed before reaching the bridge to maintain vehicle stability without abrupt braking.

Step-by-Step Solution

1
Assess environmental hazards
Recognize that temperatures near 32∘F32^\circ\text{F} (0∘C0^\circ\text{C}) combined with moisture create invisible freezing hazards on elevated road structures.
Bridges lose heat from both top and bottom surfaces, making them freeze significantly faster than surrounding ground roadways.
2
Adjust vehicle speed proactively
Ease off the accelerator to reduce speed gradually before wheels touch the bridge surface.
Slowing down beforehand avoids the need to brake or turn sharply while on a slippery surface.

Key Concept

Bridge deck icing and speed control in near-freezing conditions
Estimated Time:1m 0s
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Topics

Driving in Adverse Weather and Low Visibility

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