A driver travels at 70 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: D. 70 m
- Step 1: Reaction distance = 21 m and braking distance = 49 m. Step 2. Stopping distance = 70 m. Answer: 70 m. Why not the others: 49 m results from having counted the braking distance only. 21 m results from having counted the reaction distance only. 91 m results from having counted the reaction distance twice.
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