CMF's for Fatal and injury SPF's

Safety performance functions, development (calibration, crash modification factors [Part C], crash proportions), IHSDM and other software

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CMF's for Fatal and injury SPF's

Postby dengstro » Fri Apr 26, 2013 2:11 pm

SPF's are given for 4 lane rural roadways (undivided and divided) as well as urban arterials for Fatal and Injury crashes and Fatal and injury crashes (minus C or possible injury). What CMF's are appropriate to use for these SPF's (lane width, shoulder width, etc..)?
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Re: CMF's for Fatal and injury SPF's

Postby mdimaiuta » Fri May 03, 2013 2:21 pm

David,

In Chapter 11, Section 11.7 summarizes the CMFs for Rural Multilane Highways. Table 11-10 (p. 11-25) provides a “Summary of CMFs in Chapter 11 and the Corresponding SPFs.” Sections 11.7.1 (p. 11-25; “CMFs for Undivided Roadway Segments”) and 11.7.2 (p. 11-29; “CMFs for Undivided Roadway Segments”) note that “Each of the CMFs applies to all of the crash severity levels shown in Table 11-3 / 11-5.” Tables 11-3 and 11-5 show SPF Coefficients for total, fatal-and-injury (KABC) and fatal-and-injury (KAB) crashes.

Likewise, in Chapter 12, Section 12.7 summarizes the CMFs that are applied to the various SPFs developed for urban/suburban arterials. Table 12-18 (p. 12-39) provides a “Summary of CMFs in Chapter 12 and the Corresponding SPFs.”

Mike Dimaiuta
IHSDM / HSM Support
ihsdm.support@dot.gov
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