United States Department of Transportation
i
Highway Safety Manual applied in Missouri - freeway/software.
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2016-06-01
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[PDF-14.41 MB]
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Edition:Final report
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Abstract:AASHTO’s Highway Safety Manual (HSM) facilitates the quantitative safety analysis of highway facilities. In a 2014
supplement, freeway facilities were added to the original HSM manual which allows the modeling of highway
interchanges. This report documents the calibration of the most vital freeway interchange facility types in Missouri. These
facility types include nine freeway interchange terminals, including diamond, partial cloverleaf, and full cloverleaf
interchanges. The non-terminal facilities included entrance and exit speed-change lanes, and entrance and exit ramps. The
calibrated facilities applied to both rural and urban locations. For each facility type, sample sites were randomly selected
from an exhaustive master list. Four types of data were collected for each site: geometric, AADT, traffic control, and crash.
Crash data was especially noteworthy because of the crash landing problem, i.e. crashes were not located on the proper
interchange facility. A significant companion crash correction project was undertaken involving the review of 12,409 crash
reports, and the detailed review of 9,169 crash reports. Using the corrected data, 44 calibration values were derived for
freeway terminal and non-terminal facilities. These values are the first reported freeway interchange calibration values
since the release of the 2014 HSM supplement.
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