A driver travels at 50 km/h on a dry road. Using the Swiss rules of thumb for reaction distance (speed ÷ 10 × 3) and braking distance ((speed ÷ 10)²), what is the total stopping distance?
Answer and explanation
Correct answer: C. 40 m
- Step 1: Reaction distance = 15 m and braking distance = 25 m. Step 2. Stopping distance = 40 m. Answer: 40 m. Why not the others: 25 m results from having counted the braking distance only. 15 m results from having counted the reaction distance only. 55 m results from having counted the reaction distance twice.
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