Assessing Transferability of Highway Safety Manual Crash Prediction Models to Data from Italy

For decades, crashes have been studied as discrete events with the focus on the circumstances of the crash. This type of analysis has been used to identify the characteristics of roadway features associated with higher crash experience, but other factors, such as traffic volumes, driver characteristics, land use, and environmental conditions, are also needed to explain or describe crash events. The Highway Safety Manual (HSM) provides a predictive method to estimate the expected average crash frequency of a site in given geometric and geographic conditions over a specific period for a specific annual average daily traffic volume. The study presented here investigated whether the modeling results closely matched the crash records. The HSM algorithms were used to assess transferability as a whole. The results suggested that implementing the HSM techniques should foster the development of local safety performance functions and accident modification factors. Calibration preserved the original HSM model form and the relationship between independent variables and crashes. To adjust the base predicted crash frequency to meet the current conditions, the accident modification factor calculations for lane width, horizontal curves, and vertical grades were made. Crash types (head-on and side collisions, single-vehicle crashes, and rear-end collisions) were investigated on the basis of the vertical grade and the curvature indicator. The estimated model provides planners and designers with a tool better able to target and select countermeasures to address these specific aspects and results in improved project selection and improved safety.

• Record URL:
  https://doi.org/10.3141/2433-15
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309295215
• Authors:
  • Russo, Francesca
  • Busiello, Mariarosaria
  • Biancardo, Salvatore A
  • Dell’Acqua, Gianluca
• Publication Date: 2014

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Maps; References; Tables;
• Pagination: pp 129–135
• Monograph Title: Geology and Properties of Earth Materials 2014
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2433
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Annual average daily traffic; Automobile drivers; Crash modification factors; Frontal crashes; Highway curves; Highway safety; Land use; Rear end crashes; Single vehicle crashes; Traffic lanes; Traffic volume; Width
• Identifier Terms: Highway Safety Manual
• Geographic Terms: Italy
• Subject Areas: Geotechnology; Highways; Pavements; Planning and Forecasting; Safety and Human Factors; I81: Accident Statistics; I85: Safety Devices used in Transport Infrastructure;

Filing Info

• Accession Number: 01520308
• Record Type: Publication
• ISBN: 9780309295215
• Report/Paper Numbers: 14-0135
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Mar 27 2014 3:38PM