Desktop Reference for Crash Reduction Factors

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U.S. Department of Transportation
Federal Highway Administration
Office of Safety
1200 New Jersey Avenue, SE
Washington, DC 20590

September 2008

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Technical Documentation Page

1. Report No.: FHWA-SA-08-011 2. Government Accession No.: 3. Recipient's Catalog No.:
4. Title and Subtitle

Desktop Reference for Crash Reduction Factors
5. Report Date: September 2008
6. Performing Organization Code:
iTRANS Consulting Ltd.
7. Authors: Bahar, Geni; Masliah, Maurice; Wolff, Rhys; Park, Peter 8. Performing Organization
Report No.: 7067
9. Performing Organization Name and Address: 10. Work Unit No.:
iTRANS Consulting Ltd.
1220 L Street NW, #100-467
Washington, DC 2005-4018
Vanasse Hangen Brustlin, Inc
8300 Boone Blvd., Ste. 700
Vienna, VA 22182-2626
10. Work Unit No.:
11. Contract or Grant No.:
12. Sponsoring Agency Name and Address:
U.S. Department of Transportation
Federal Highway Administration (FHWA)
Office of Safety
1200 New Jersey Avenue, SE
Washington, DC 20590
13. Type of Report and Period
Covered: Information Guide Book
January 2007 – September 2008
14. Sponsoring Agency Code:
15. Supplementary Notes: FHWA Office of Safety Contract Task Order Manager Dr. Clayton Chen and Karen Yunk.
16. Abstract. This Desktop Reference documents the estimates of the crash reduction that might be expected if a specific countermeasure or group of countermeasures is implemented with respect to intersections, roadway departure and other non-intersection crashes, and pedestrian crashes. The estimates of crash reduction are known as Crash Reduction Factors (CRFs), and represent the information available to date. Where available, the Desktop Reference includes multiple CRFs for the same countermeasure to allow the reader to review the range of potential effectiveness. The CRFs are a useful as a guide, but it remains necessary to apply engineering judgment and to consider site-specific environmental, traffic volume, traffic mix, geometric, and operational conditions which will affect the safety impact of a countermeasure. This report is a revision of Report FHWA-SA-07-015.
17. Key Words: crash reduction factor, CRF, intersection crashes, pedestrian crashes, roadway departure crashes 18. Distribution Statement:
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161
19. Security Classification (of this report): Unclassified 20. Security Classifications (of this page): Unclassified 21. No. of Pages: 112 22. Price
Form DOT F 1700.7 (8-72)
Reproduction of completed pages authorized

Table of Contents



Crash Reduction Factors

Crash Reduction Functions

Using the Tables

Tables for Intersection Crash Reduction Factors

Tables for Roadway Departure Crash Reduction Factors

Tables for Pedestrian Crash Reduction Factors


List of Tables

Table 1. Signalization Countermeasures
Table 2. Geometric Countermeasures
Table 3. Signs/Markings/Operational Countermeasures
Table 4. Barrier Countermeasures
Table 5. Bridge Countermeasures
Table 6. Geometric Countermeasures
Table 7. Median Countermeasures
Table 8. Roadside Countermeasures
Table 9. Signs/Markings/Operational Countermeasures
Table 10. Signalization Countermeasures
Table 11. Geometric Countermeasures
Table 12. Signs/Markings/Operational Countermeasures


This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. This United States Government assumes no liability for its contents or use thereof. This report does not constitute a standard, specification, or regulation.

Quality Assurance Statement

The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.


This report is a revision of Report FHWA-SA-07-015. This report includes hyperlinks to the source references, which may be found in the References section in the electronic version of this report.

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