If a CMF for a countermeasure is 0.8, what does this imply?

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Study for the Road Safety Professional Level 1 Exam. Enhance your knowledge with multiple-choice questions and explanations. Prepare effectively and succeed!

Multiple Choice

If a CMF for a countermeasure is 0.8, what does this imply?

Explanation:
Crash Modification Factor shows how crashes change after a countermeasure compared with before. A CMF of 0.8 means the post-countermeasure crashes are 0.8 times the baseline, which is a 20% reduction in crashes. This is the best interpretation because a value below 1 indicates fewer crashes, a value of 1 would mean no change, and a value above 1 would indicate more crashes. For example, if there were 100 crashes before, you’d expect about 80 after the countermeasure.

Crash Modification Factor shows how crashes change after a countermeasure compared with before. A CMF of 0.8 means the post-countermeasure crashes are 0.8 times the baseline, which is a 20% reduction in crashes. This is the best interpretation because a value below 1 indicates fewer crashes, a value of 1 would mean no change, and a value above 1 would indicate more crashes. For example, if there were 100 crashes before, you’d expect about 80 after the countermeasure.

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