Development of Crash Modification Factors for Lane Departure Countermeasures

Lane departure crashes make up a large percentage of rural crashes for states in the midwest. Since agencies have limited resources, they rely on studies that demonstrate the effectiveness of a particular countermeasure in order to make decisions about which countermeasures should be selected. Most agencies prefer countermeasure effectiveness to be stated in terms of crash modification factors (CMFs) since they are easily understood and commonly used by agencies. Developing data driven performance measures for safety is one of the main Midwest Transportation Center (MTC) themes and robust CMFs have not been developed for a number of lane departure countermeasures. The objective of this research is to develop CMFs for several lane departure countermeasures that have been used in Iowa. The research includes selecting sites where the countermeasures have been installed, identifying control sites, extracting site characteristics, reducing crash data, conducting analyses, and summarizing results. The team developed tech briefs for the following lane departure countermeasures as determined by the technical advisory committee: · Safety Edge · Chevrons · Destination lighting at stop-controlled intersections · Stop-sign beacons

• Record URL:
  http://www.intrans.iastate.edu/mtc/index.cfm/research/project/project/779447058
• Record URL:
  http://www.intrans.iastate.edu/research/projects/detail/?projectID=779447058
• Record URL:
  http://www.intrans.iastate.edu/publications/_documents/t2summaries/safety_edge_cmfs_tb.pdf
• Record URL:
  http://www.intrans.iastate.edu/publications/_documents/t2summaries/chevron_cmfs_tb.pdf
• Record URL:
  http://www.intrans.iastate.edu/publications/_documents/t2summaries/destination_lighting_at_stop_controlled_intersects_tb.pdf
• Record URL:
  http://www.intrans.iastate.edu/publications/_documents/t2summaries/stop-sign_beacons_cross-sectional_tb.pdf
• 
• Supplemental Notes:
  • Iowa Department of Transportation ($98,448.00) USDOT/OST-R ($72,182.00) Total: $170,630.00

Language

• English

Project

• Status: Completed
• Funding: $170630.00
• Contract Numbers:

  DTRT13-G-UTC37

• Sponsor Organizations:

  Midwest Transportation Center

  Iowa State University
  2711 S 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

  Iowa Department of Transportation

  800 Lincoln Way
  Ames, IA  United States  50010
• Managing Organizations:

  Midwest Transportation Center

  Iowa State University
  2711 S Loop Drive, Suite 4700
  Ames, IA  United States  50010-8664
• Performing Organizations:

  Iowa State University, Ames

  Center for Transportation Research and Education
  2711 South Loop Drive, Suite 4700
  Ames, IA  United States  50010-8664
• Principal Investigators:

  Hallmark, Shauna

• Start Date: 20140801
• Expected Completion Date: 20171231
• Actual Completion Date: 0
• Source Data: RiP Project 39363

Subject/Index Terms

• TRT Terms: Countermeasures; Crash modification factors; Intersections; Median barriers; Paved shoulders; Ran off road crashes; Rumble strips
• Uncontrolled Terms: Safety edge (Pavement safety feature)
• Geographic Terms: Iowa; Midwestern States
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 01560545
• Record Type: Research project
• Source Agency: Midwest Transportation Center
• Contract Numbers: DTRT13-G-UTC37
• Files: UTC, RIP
• Created Date: Apr 16 2015 1:01AM