Safety Performance Functions for Freeway Merge Zones

This report documents the results of a research project to support the Colorado Department of Transportation (CDOT) in the area of Safety Performance Function (SPF) development. The project involved collecting data and developing SPFs for ramp-freeway merge zones categorized as isolated, non-isolated and weave. Tor each of these three categories, data for the period 2007 to 2011 were collected at sites selected to ensure statewide geographical representation and coverage of the range of traffic volume and other variables in each category. The development of SPFs for the three categories of ramp-freeway merge zones was successful. Separate SPFs were developed for Total, fatal+injury (FI) and Property Damage Only (PDO) crashes. CDOT can use the developed SPFs immediately to apply state-of-the-art methodologies for road safety management activities.

• Record URL:
  • http://www.coloradodot.info/programs/research/pdfs/2013/spf.pdf/at_download/file
• 
• Corporate Authors:

  Persaud and Lyon, Incorporated

  87 Elmcrest Road
  Toronto, Ontario  Canada  M9C 3R7

  Colorado Department of Transportation

  4201 E Arkansas Avenue
  Denver, CO  United States  80222

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Lyon, Craig
  • Persaud, Bhagwant
  • Hattan, David E
  • Renner, Gabrielle
• Publication Date: 2013-12

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Tables;
• Pagination: 35p

Subject/Index Terms

• TRT Terms: Crash data; Data collection; Freeways; Interchange ramps; Merging area
• Identifier Terms: Safety Performance Functions
• Geographic Terms: Colorado
• Subject Areas: Highways; Safety and Human Factors; I81: Accident Statistics;

Filing Info

• Accession Number: 01505862
• Record Type: Publication
• Report/Paper Numbers: CDOT-2013-12
• Contract Numbers: 90.75
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jan 27 2014 1:42PM