If Countermeasure A has CMF 0.70 and Countermeasure B has CMF 0.90, and they address different crash types, what is the combined CMF?

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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 Countermeasure A has CMF 0.70 and Countermeasure B has CMF 0.90, and they address different crash types, what is the combined CMF?

Explanation:
When multiple countermeasures are used, the overall or combined CMF is found by multiplying their individual CMFs, assuming their effects are independent. Here, 0.70 and 0.90 multiply to 0.63, so the combined CMF is 0.63. This means overall crashes are expected to be 63% of the baseline, or a 37% reduction, when both measures are in place. The other values don’t fit because 1.60 would imply more crashes than baseline, which isn’t a CMF scenario. A single CMF of 0.70 or 0.90 would ignore one of the measures, whereas the question’s setup implies both are implemented, yielding the product 0.63.

When multiple countermeasures are used, the overall or combined CMF is found by multiplying their individual CMFs, assuming their effects are independent. Here, 0.70 and 0.90 multiply to 0.63, so the combined CMF is 0.63. This means overall crashes are expected to be 63% of the baseline, or a 37% reduction, when both measures are in place.

The other values don’t fit because 1.60 would imply more crashes than baseline, which isn’t a CMF scenario. A single CMF of 0.70 or 0.90 would ignore one of the measures, whereas the question’s setup implies both are implemented, yielding the product 0.63.

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