Crash Modification Factors in the Highway Safety Manual: A Review (2023) / Chapter Skim
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Pages 13-22

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From page 13...
... 13   Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use This chapter discusses how a new rating system for CMFs was developed. It also includes recommendations for how CMFs may be incorporated in the HSM and a proposed framework that is applicable for practitioner use.
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From page 14...
... 14 Crash Modification Factors in the Highway Safety Manual: A Review published CMFs. With this option, a table showing the following information would be pro­ vided for each treatment: • Setting (intersection or roadway type)
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From page 15...
... Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use 15 4.1.2.3 Disadvantages • Unlike the CMF Clearinghouse, the HSM is not a free product. However, that is not necessarily a disadvantage of Part D, but of the HSM as a whole.
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From page 16...
... 16 Crash Modification Factors in the Highway Safety Manual: A Review 4.1.4.2 Advantages • There is no cost to access the CMF Clearinghouse. • The CMF Clearinghouse is continuously updated with emerging studies.
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From page 17...
... Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use 17 rating systems. The rating systems included a list of factors and levels.
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From page 18...
... 18 Crash Modification Factors in the Highway Safety Manual: A Review individuals from the TRB Highway Safety Performance Committee and AASHTO HSM: Raul Avelar, Geni Bahar, Michael Dimaiuta, Karen Dixon, Dennis Emidy, Doug Harwood, John Ivan, Jeffrey Pulver, Stephen Read, Karen Scurry, and Derek Troyer. Before the meeting on May 13, 2020, the task force was provided with the following materials: • A memorandum summarizing the goals of the meeting.
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From page 19...
... Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use 19 be smaller. Although this was considered a legitimate issue, it was also recognized that smaller sample sizes are also associated with less­reliable CMFs.
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From page 20...
... 20 Crash Modification Factors in the Highway Safety Manual: A Review extract this information. Similarly, the project team needed to review the studies to distinguish between "Unknown" and "No." This re­review of the studies was not included in the original scope of work.
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From page 21...
... Recommendations for Incorporating CMFs in the HSM and Possible Framework for Practitioner Use 21 that the PDF with HSM2­approved CMFs is not needed. However, this decision would have to be approved by AASHTO.
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From page 22...
... 22 Crash Modification Factors in the Highway Safety Manual: A Review 100 points or more. Table 1 shows the results when a fixed scale for the number of crashes was used and Table 2 the results when a continuous scale was used.
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