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APPENDICES 131 Appendix A: References Crash Modification Factors (CMF) Clearinghouse: http://www.cmfclearinghouse.org. FHWA Training Courses: http://nhi.fhwa.dot.gov. HSM website: www.highwaysafetymanual.org. Purchase the HSM: http://bookstore.transportation.org; search under code HSM-1. Interactive Highway Safety Design Module (IHSDM) website: http://www.tfhrc.gov/safety/ihsdm/ihsdm.htm. NCHRP Research Results Digest 329: Highway Safety Manual Data Needs Guide. 2008. Transportation Research Board, Washington, D.C. www.trb.org/Publications/Blurbs/Highway_Safety_Manual_ Data_Needs_Guide_159984.aspx. SafetyAnalyst website: http://www.safetyanalyst.org.