Safety Edge Crash Modification Factors

The Safety Edge is a relatively low-cost countermeasure that can be applied in both asphalt and concrete paving operations. The Safety Edge has been promoted as a low-cost countermeasure to reduce the frequency and severity of rural roadway departure crashes. However, there is little information about the actual effectiveness of the Safety Edge in reducing the number and severity of crashes. This study evaluated the safety impact of the Safety Edge for construction projects in 2010 and 2011 in Iowa to assess the effectiveness of the treatment in reducing crashes. The researchers conducted an observational before-and-after study using an empirical Bayes methodology. Models were developed for total all non-intersection crashes and run-off-road (ROR)/target crashes. Results indicate a reduction of 8 to 16% depending on the type of crash.

• Record URL:
  http://publications.iowa.gov/22633/1/IADOT_InTrans_14_509_Safety_Edge_Crash_Modification_Factors_Tech_Brief_2016.pdf
• Record URL:
  http://www.intrans.iastate.edu/publications/_documents/t2summaries/safety_edge_cmfs_tb.pdf
• 
• Summary URL:
  http://publications.iowa.gov/22633/
• Corporate Authors:

  Iowa State University, Ames

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

  Iowa Department of Transportation

  Ames, IA  United States  50010

  Midwest Transportation Center

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

  Office of the Assistant Secretary for Research and Technology

  Washington DC,   United States  20590

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Hallmark, Shauna L
  • Goswamy, Amrita
  • Pawlovich, Michael
• Publication Date: 2016-8

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Tech Brief
• Features: Photos; References; Tables;
• Pagination: 7p
• Serial:
  • Tech Brief
  • Publisher: Iowa State University, Ames

Subject/Index Terms

• TRT Terms: Bayes' theorem; Before and after studies; Crash rates; Crash severity; Dropoffs (Pavements); Highway safety; Pavement design; Ran off road crashes
• Geographic Terms: Iowa
• Subject Areas: Design; Highways; Pavements; Safety and Human Factors;

Filing Info

• Accession Number: 01611980
• Record Type: Publication
• Contract Numbers: DTRT13-G-UTC37; InTrans Project 14-509
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Sep 6 2016 11:36AM