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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    Title :

    Highway Safety Manual Applied in Missouri- Freeway/Software


    Contributors:
    C. Sun (author) / P. Edara (author) / H. Brown (author) / C. Nemmers (author) / B. Claos (author) / A. Khezerzadeh (author)

    Publication date :

    2016


    Size :

    280 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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