Crash Modification Factors in the Highway Safety Manual: A Review (2023) / Chapter Skim
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Pages 32-34
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32 Validation of SPF Adjustment Factors Each chapter in Part C of the HSM1 describes a safety prediction method for a specific facility type (e.g., rural twolane twoway roads)
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Validation of SPF Adjustment Factors 33 The steps in this approach are as follows: • Step 1: Apply the base condition models to a data set of sites that meet all base conditions except for the variables of interest. For this variable, site selection is not constrained.
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From page 34... ...
34 Crash Modification Factors in the Highway Safety Manual: A Review 8.2 Results Section 5 of Appendices K, L, and M provides a detailed discussion of the validation exercise for segments on rural twolane roads, urban segments, and intersections, respectively. Generally, in most cases, sample sizes were too small to conclude with high confidence that the implied adjustment factors were statistically similar to the ones being validated.
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