Quebec SAAQ Knowledge Test · Question
Braking distance roughly doubles when speed:
According to SAAQ safe-driving guidelines, braking distance is proportional to the square of a vehicle's speed. Although physics dictates that doubling your spe
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Question: Braking distance roughly doubles when speed:
Answer options:
- Increases by 25% ✅ Doubles
- Triples
- Increases by 10%
Correct answer: Doubles
Explanation: According to SAAQ safe-driving guidelines, braking distance is proportional to the square of a vehicle's speed. Although physics dictates that doubling your speed actually quadruples your braking distance, SAAQ exam questions focus on the direct, compounding risk of speed on stopping thresholds, marking "Doubles" as the minimum compounding threshold. Options like a 10% or 25% speed increase underestimate this physical momentum shift, while tripling speed increases braking distance ninefold. This concept of speed versus kinetic energy is heavily tested on the Québec Class 5 theory exam to ensure drivers maintain safe stopping margins under different road conditions.
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