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- W622701047 abstract "There is a need to raise awareness about the issues associated with estimating the safety effects of multiple treatments. Specifically, crash modification factors (CMFs) are one tool to support this effort, but further research and guidance is needed to help practitioners estimate the expected safety effects when multiple treatments are implemented at a given location. Relatively few CMFs have been developed for combination treatments, and it would take a tremendous effort to develop CMFs for all likely combinations of treatments. Combining individual CMFs is one alternative to developing CMFs for every possible treatment combination. The issue is that there is limited guidance on the application of multiple CMFs, and the existing guidance has not been rigorously tested. This paper presents existing methods for combining multiple CMFs and identifies related issues. The primary issue is whether it is valid to assume that the effects of individual treatments are independent. If multiple treatments are not independent and the CMFs are simply multiplied to estimate the combined effect, the result may be an over- or underestimation of the combined treatment effect. A framework is developed for investigating interrelationships between treatments, and a matrix is provided to help identify potential overlapping effects. Six distinct scenarios are identified based on potential interrelationships and the applicability of CMFs. Scenarios 1 through 3 are relatively straightforward (i.e., no overlapping treatment effects) and currently accepted methods for combining CMFs are presented for each of the three scenarios. Scenarios 4 through 6 are more complex (i.e., overlapping treatment effects). Several methods are proposed for estimating the combined effects of multiple treatments, but it is emphasized that there has been very little research to support these methods." @default.
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- W622701047 date "2012-01-01" @default.
- W622701047 modified "2023-09-24" @default.
- W622701047 title "Issues Related to the Combination of Multiple CMFs" @default.
- W622701047 hasPublicationYear "2012" @default.
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