Crash Location Correction for Freeway Interchange Modeling

The American Association of State Highway and Transportation Officials (AASHTO) released a supplement to the Highway Safety Manual (HSM) in 2014 that includes models for freeway interchanges composed of segments, speed-change lanes and terminals. A necessary component to the use of HSM is having the appropriate safety-related data. However, a high percentage, approximately 75 percent, of interchange crashes on the Missouri Department of Transportation (MoDOT) Transportation Management System (TMS) systems are landed on an incorrect location within an interchange. For example, crashes are frequently placed in the midpoint of the ramp terminal instead of properly assigned to one of the two ramp terminals. Another example is crashes that are assigned to the freeway mainline when the crashes are related to ramps. In order to properly calibrate and use HSM freeway interchange models, the location of crashes needs to be corrected. The crash landing correction involves the visual inspection of crash images compiled by the Missouri State Highway Patrol. A detailed procedure was established along with a reviewer test so that crash correction can be conducted uniformly among multiple reviewers. A total of 10,897 crashes were reviewed, and 9,168 underwent detailed review and correction. Of the total, 1482 were partial cloverleaf crashes, 5086 were diamond interchange crashes, 780 were ramp crashes, and 1820 were speed-change lane crashes. The crash location correction process helped to eliminate the error rate of 69% associated with interchange crash locations. Any analyst can correct crash locations by following the procedure detailed in this report.

• Record URL:
  https://spexternal.modot.mo.gov/sites/cm/CORDT/cmr16-010.pdf
• Record URL:
  http://www.intrans.iastate.edu/research/documents/research-reports/crash_location_correction_for_freeway_interchange_modeling_w_cvr.pdf
• 
• Supplemental Notes:
  • Report date: March 2016; published: June 2016. This report is also available at: http://www.intrans.iastate.edu/research/documents/research-reports/crash_location_correction_for_freeway_interchange_modeling_w_cvr.pdf, with a report date of January 2017.
• Corporate Authors:

  University of Missouri, Columbia

  Department of Civil and Environmental Engineering
  Columbia, MO  United States  65211-2200

  Missouri Department of Transportation

  Construction and Materials Division
  Jefferson City, MO  United States  65102

  Midwest Transportation Center

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

  Department of Transportation

  Office of the Assistant Secretary for Research and Technology
  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Sun, Carlos
  • 0000-0002-8857-9648
  • Edara, Praveen
  • Brown, Henry
  • Nemmers, Charles
  • Claros, Boris
  • Khezerzadeh, Amir
  • Zhang, Mengyuan
  • Nam, Kyoungmin (Andrew)
  • Berry, Jacob
• Publication Date: 2016-3

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 88p

Subject/Index Terms

• TRT Terms: Crash data; Crash locations; Data collection; Freeways; Highway safety; Information processing; Interchange ramps; Interchanges
• Identifier Terms: Highway Safety Manual; Missouri Department of Transportation
• Geographic Terms: Missouri
• Subject Areas: Data and Information Technology; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 01603661
• Record Type: Publication
• Report/Paper Numbers: cmr 16-010, MoDOT project# TR201504, MoDOT Report cmr 16-010
• Contract Numbers: DTRT13-G-UTC37
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jun 28 2016 4:41PM