Application of Crash Modification Factors for Access Management, Volume 2: Research Overview (2021) / Chapter Skim
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Pages 65-69
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65 Study Design Introduction This chapter presents a study design to answer the primary research question: How does the existing Highway Safety Manual (1st Edition)
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66 Application of Crash Modification Factors for Access Management had the same base condition as sites used in developing the NCHRP Project 17-62 SPFs. Table 56 shows the base conditions for NCHRP Project 17-62 SPFs.
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Study Design 67 the crash prediction models to the data. In addition, CURE plots and assessment tables were developed to assess levels or ranges of data for access-management-related variables where the crash prediction models may be consistently over- or under-predicting crashes.
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68 Application of Crash Modification Factors for Access Management individually over all sites. Figure 19 shows the equation to compute the calibration factor for the SPF of a given facility type (C)
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Study Design 69 Each estimated calibration factor is a random variable with an associated variance. The CMF is thus the ratio of two random variables.
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