The dominant effect method applies the CMF for only the most effective treatment. The most effective treatment is the treatment with the lowest CMF value. This method is intended to be the simplest and most conservative approach. Typically, this method would be applied when the applicable CMFs are not independent of one another and have extreme overlap in the crash type and/or severity that are affected. The primary limitation of this method is that it is likely to underestimate the combined treatment effect if the additional treatments also improve safety.