Validation and application of highway safety manual (part D) in Florida.
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Validation and application of highway safety manual (part D) in Florida.

Filetype[PDF-3.74 MB]


English
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Details:

  • Creators:
  • Corporate Creators:
    University of Central Florida. Dept. of Civil, Environmental and Construction Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    BDK78-977-14
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Corporate Publisher:
    Florida. Dept. of Transportation
  • Abstract:
    The Highway Safety Manual (HSM) Part D provides a comprehensive list of the effects of safety

    treatments (countermeasures). These effects are quantified by crash modification factors (CMF), which are based

    on compilation from past studies of the effects of various safety treatments. The HSM Part D provides CMFs for

    treatments applied to roadway segments (e.g., roadside elements, alignment, signs, rumble strips, etc.),

    intersections (e.g., control), interchanges, special facilities (e.g., highway-rail crossings), and road networks.

    Thus, an assessment of the applicability of the HSM in Florida is essential. The objectives of this study are (1) to

    develop CMFs for various treatments in Florida for the same setting (rural/urban), road type, crash type, and

    severity level, (2) to evaluate the difference between these Florida-specific CMFs and the CMFs in the HSM, and

    (3) to recommend whether the CMFs in the HSM can be applied to Florida or new Florida-specific CMFs are

    needed. Different methods of observational study – before-after (B-A) and cross-sectional (C-S) – were used to

    calculate CMFs for a total of 17 treatments applied to roadway segments, intersections and special facilities. The

    CMFs calculated using the before-after with comparison-group (C-G) and empirical Bayesian (EB) methods,

    only the CMF with lower standard error was selected. The methods of calculating CMFs were determined based

    on the availability of the data and the methods used in the HSM, if the CMFs were provided in the HSM. It was

    found that Florida-specific CMFs were generally statistically significant, and safety effects represented by the

    CMFs were intuitive, similar to the CMFs in the HSM. It was also found that Florida-specific CMFs for the

    treatments not included in the HSM showed significant positive effects in reducing crash frequencies.

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