Lockwood, Stephen, Singleton, Anne, Wallace, Charles E, Sergent, Jason, Boyd, Annabelle, Transportation Research Board. "Step 2 - Conduct Research to Identify Hazards and Threats and Analyze Gathered Data." NCHRP Report 525 Volume 16: A Guide to Emergency Response Planning at State Transportation Agencies. Washington, DC: The National Academies Press, 2011.
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