Guidelines for the Development and Application of Crash Modification Factors (2022) / Chapter Skim
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1 Crash modification factors (CMFs) provide transportation professionals with the kind of quantitative information they need to make decisions on where best to invest limited safety funds.
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2 Guidelines for the Development and Application of Crash Modification Factors Quantifying the Effect of Multiple Treatments at a Single Location Often a transportation agency will apply multiple treatments to a location, such as signalizing a stop-controlled intersection, adding turn lanes, and reducing intersection skew. The preferred approach to estimate the combined safety effect of multiple treatments is to apply a single CMF that represents the combined treatments.
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Summary 3 Appendix B -- Procedure for Estimating the Combined Safety Effect of Two Treatments These guidelines present a recommended method to estimate the combined safety effect of two treatments at the same location. It is structured in a step-by-step method to guide the user through the process of determining the potential overlap of the effects of the treatments, the magnitudes of the individual treatments, and the method for calculating the magnitude of the combined effect.
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