Ontario G1 Knowledge Test — G1 Practice Question
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Accuracy —
Rules of the Road
During freezing rain, bridges and overpasses freeze first because:
Show Answer & Explanation
Correct Answer: B. They lose heat from both above and below
Bridge surfaces have no ground heat to draw from underneath, so they drop below 0°C faster than surrounding pavement. Treat any shiny-looking bridge in near-freezing conditions as icy — reduce speed before reaching it.
Why the other answers are wrong
- A.They are at higher elevationElevation is a contributor but the heat-loss mechanism is the core.
- C.They are closer to the skySky proximity is irrelevant.
- D.Cars drive slower on bridgesSpeed is not the cause of freezing.