5.4.2 General Overview of CMFs
A CMF is an estimate of the anticipated change in crash frequency that can be expected because of implementing a particular countermeasure at a specific site. A CMF is a multiplicative factor that can be multiplied by the number of observed or predicted crashes at a specific site to compute the number of anticipated crashes after a given countermeasure is implemented. CMF calculations are presented in .
Figure 5-7: CMF Calculation
A CRF is similar to a CMF but stated as the percent reduction in crashes after a given countermeasure is implemented at a specific site. The CRF calculation based on the CMF is presented in .
Figure 5-8: Crash Reduction Factor Calculation