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39  Development of Guidance on the Selection, Application, and Development of CMFs There is a need for explicit guidance on the proper selection and application of the CMFs to be included in Part D of the HSM. This need was identified on the basis of various sources and stemmed from discussions at the TRB annual meeting and from the survey conducted at the beginning of NCHRP 17Â72. Discussions conducted during meetings of the CMF sub committee of the TRB Highway Safety Performance Committee and the annual meetings of the FHWA Evaluation of LowÂCost Safety Improvements Pooled Fund Study and Developing Crash Modi fication Factors contracts indicated a strong desire for augmenting Part D with more guidance on the selection, application, and development of CMFs. The intent was that this guidance should provide an overview of CMF selection, application, and development with a focus on counter measureÂspecific CMFs that are a key part of the processes and methods described in Part B of the HSM. In the HSM2, Part D will not provide CMFs for countermeasures. Instead, it will provide infor mation to help CMF users identify, select, and apply CMFs contained in the CMF Clearinghouse (www.cmfclearinghouse.org) and other resources. Part D will also provide information on fundamental concepts related to CMF development. C H A P T E R 1 1
