Crash Rate per 100 Million Vehicle-Km
Hardsafetycrash rate
A 2.5 km road segment with an ADT of 8,000 vehicles experienced 12 crashes over three years. The crash rate per 100 million vehicle-kilometres is most nearly:
- A18
- B37
- C55
- D82
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Answer: C. 55
Total exposure is (8,000 veh/day)(365 days)(3 years)(2.5 km) = 2.19 × 10⁷ vehicle-kilometres. The rate is then (12)(10⁸)/(2.19 × 10⁷) ≈ 55 crashes per 100 million vehicle-km. Forgetting to multiply by the segment length is the most common slip and inflates the rate by a factor of 2.5.
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