In crash modification analysis, CMF stands for:

• A. Crash Modification Factor
• B. Crashes Modification Formula
• C. Collision Management Factor
• D. Crash Mitigation Factor

Answer: (A)

The main idea is that CMF stands for Crash Modification Factor, which is the ratio of crashes after a safety change to crashes before the change. It quantifies how much a modification affects crash frequency. If the CMF is less than 1, the treatment reduces crashes; if it’s greater than 1, crashes may increase; if it equals 1, there’s no expected change. This lets engineers predict and compare the effectiveness of different safety improvements by applying the CMF to the baseline crash count to estimate post‑treatment crashes. For example, with a baseline of 25 crashes per year, a CMF of 0.72 would suggest about 18 crashes per year after the improvement. CMFs come from empirical studies and are specific to context, such as roadway type and traffic conditions. The other terms listed aren’t standard in crash modification analysis.