Missouri Highway Safety Manual Recalibration

The Highway Safety Manual (HSM) is a national manual for analyzing the highway safety of various facilities, including rural roads, urban arterials, freeways, and intersections. The HSM was first published in 2010, and a 2014 supplement addressed freeway interchanges. The HSM incorporated the safety modeling results from several National Cooperative Highway Research Program projects that used data from various states across the nation. The HSM recommended that individual states calibrate the HSM to local conditions on a regular basis. An initial statewide calibration for Missouri was finalized in 2013. The current recalibration effort builds upon the previous calibration and is designed to keep the calibration values up to date with the most current crash data and calibration methodologies. The current effort also involves the development of crash severity distribution functions so that crash frequencies can be estimated according to the severity categories of fatal, severe injury, minor injury, and property damage only. HSM calibration is a labor-intensive effort that requires the collection and use of detailed data such as road geometrics, traffic volumes, traffic signalization, land use, and crash frequency and severity. This report documents the details of the methodology employed for facility site selection, data collection, data processing, calibration, and severity assignment. Sixteen facility types were calibrated. These included rural two-lane segments with the related three-leg and four-leg intersections; rural multilane segments with the related three-leg and four-leg intersections; urban two-, four- and five-lane arterial segments; urban and rural four-lane and urban six-lane freeway segments; urban three- and four-leg signalized intersections; and urban three- and four-leg unsignalized intersections. The calibration results indicated that the HSM predicted Missouri crashes reasonably well, with the exception of a few site types for which it may be desirable for Missouri to develop its own safety performance functions in the future.

• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/36043
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  Midwest Transportation Center

  2711 South Loop Drive, Suite 4700
  Ames, IA  United States  50010-8664

  Missouri Department of Transportation

  1617 Missouri Blvd.
  P.O. Box 270
  Jefferson City, MO  United States  65102

  University of Missouri, Columbia

  Department of Civil and Environmental Engineering, E2509 Lafferre Hall
  Columbia, MO  United States  65203

  Iowa State University, Ames

  Institute for Transportation
  2711 South Loop Drive, Suite 4700
  Ames, Iowa  United States  50010-8664

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Sun, Carlos
  • Edara, Praveen
  • Brown, Henry
  • Berry, Jacob
  • Claros, Boris
  • Yu, Xiang
• Publication Date: 2018-5

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 229p

Subject/Index Terms

• TRT Terms: Calibration; Crash data; Crash injuries; Crash rates; Crash severity; Highway safety; Injury severity; Traffic data
• Identifier Terms: Highway Safety Manual
• Geographic Terms: Missouri
• Subject Areas: Highways; Planning and Forecasting; Safety and Human Factors;

Filing Info

• Accession Number: 01676621
• Record Type: Publication
• Contract Numbers: Part of DTRT13-G-UTC37
• Files: UTC, NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jul 26 2018 2:42PM