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

Details

• Creators:
  Abdel-Aty, Mohamed A. ; Lee, Chris ; Park, Juneyoung ; Wang, Jung-Han ; Abuzwidah, Muamer ; Al-Arifi, Saif
• Corporate Creators:
  University of Central Florida. Dept. of Civil, Environmental and Construction Engineering
• Subject/TRT Terms:
  • Highway safety
  • Manuals
  • Countermeasures
  • Traffic accidents
  • Before and after studies
  • Accident data
  • Validation
• 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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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27272/dot_27272_DS1.pdf
• File Type:
  [PDF - 3.74 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:d048a5f77ffd963a0d766a7a265e2870bf43ea6fcef3200bc62e04ea12088f5d