Validation and application of Highway Safety Manual (Part D) and developing Florida CMF Manual, phase 2.

Details

• Creators:
  Abdel-Aty, Mohamed Ahmed ; Park, Juneyoung ; Wang, Jung-Han ; Abuzwidah, Muamer
• Corporate Creators:
  University of Central Florida. Center for Advanced Transportation Systems Simulation
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  • Before and after studies
  • Countermeasures
  • Highway safety
  • Crash modification factors
  • safety performance functions
  • combining methods
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  University of Central Florida
• 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, intersections, interchanges, freeways, and special facilities. Nevertheless, it is essential to verify ; the applicability of the HSM CMFs in specific locales. ; The objectives of this study are (1) to develop CMFs for various treatments in Florida for the same setting ; (rural/urban), road types, crash types, and severity levels, (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. Moreover, in phase II, various Florida-specific CMFs and crash modification ; functions (CMFunctions) were estimated for the most common treatments in Florida. As with phase I of the project, ; there is a need to improve some CMFs that had insufficient data. An alternative way to combine multiple CMFs to ; identify the effectiveness of multiple treatments was suggested in this study. ; Different methods of observational studies were used to calculate CMFs and to develop CMF functions for a ; total of 37 additional treatments applied to roadway segments, intersections and special facilities. It was found that ; Florida-specific CMFs were generally statistically significant, and the 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. We also present a Florida-specific ; manual of CMFs.
  More +
• Format:
  PDF
• Funding:
  BDV24-977-05
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30994/dot_30994_DS1.pdf
• File Type:
  [PDF - 2.58 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2aa5db4d56b1cbe58f07db79236ee694cb6643b8f3ce3355eeb3c78b153f489a