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- Unpublished values provided by National Highway Traffic Safety Administration.
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- Federal Highway Administration, Federal-Aid Policy Guide, Title 23 - Code of Federal Regulations, Subchapter J – Highway Safety. Accessed online June 16, 2011, https://www.fhwa.dot.gov/legsregs/directives/cfr23toc.htm.
- Government Accountability Office (GAO), Report 09-035: Highway Safety Improvement Program, Further Efforts Needed to Address Data Limitations and Better Align Funding with States’ Top Safety Priorities Regarding the HSIP, November 2008.
- Lefler, N; R. Fiedler; H. McGee; R. Pollack; and J. Miller. Background Report: Guidance for Roadway Safety Data to Support the Highway Safety Improvement Program. Federal Highway Administration, FHWA-SA-11-39, publication pending.
- Pickton, Todd, et al. Statewide Economic Benefits of Transportation Investment, Colorado Department of Transportation, 2007.
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- Kim, Y. Richard, et al. Asset Management Inventory and Data Collection, North Carolina Department of Transportation, 2009.
- Fay, Charles Sr., SHRP 2 Roadway Projects - Safety Symposium 2010 (presentation), Transportation Research Board Strategic Highway Research Program 2, 2010.
- Li, Zongzhi, et al. Project-Level Life-Cycle Benefit-Cost Analysis Approach for Evaluating Highway Segment Safety Hardware Improvements, Transportation Research Record (2160), 2010.
- Office of Management and Guidance. Circular A-94, https://obamawhitehouse.archives.gov/sites/default/files/omb/assets/a94/a094.pdf.
- National Highway Traffic Safety Administration Traffic Safety Facts: Highlights of 2009 Motor Vehicle Crashes, http://www-nrd.nhtsa.dot.gov/Pubs/811363.pdf.
- Highway Statistics, 2008. Table HM-14 Federal Aid Highway Length – 2008 Miles by Ownership. FHWA Office of Policy, October 2009.
- Fatality Analysis Reporting System (FARS). National Highway Traffic Safety Administration. http://www-fars.nhtsa.dot.gov/Main/index.aspx.