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164 References 1. Ullman, G. L., M. Pratt, M. D. Fontaine, R. J. Porter, and J. Medina. NCHRP Research Report 869: Estimating the Safety Effects of Work Zone Characteristics and Countermeasures: A Guidebook. Transportation Research Board, Washington, D.C., 2018. 2. National Work Zone Safety Information Clearinghouse. Work Zone Fatal Crashes and Fatalities. The numbers for Fatal Crashes for Work Zone, Truck-Involved Work Zone, Pedestrian- Involved Work Zone come from the Fatality Analysis Reporting System, National Highway Traffic Safety Administration, U.S. Department of Transportation. The numbers for Work Zone Worker fatalities come from the Bureau of Labor Statistics, U.S. Department of Labor (https://www.workzonesafety.org/crash-information/work-zone-fatal-crashes- fatalities/#national, accessed on September 5, 2019). 3. Data shown is an estimate and comes from the General Estimates System (GES) and the Crash Report Sampling System (CRSS), National Highway Traffic Safety Administration, U.S. Department of Transportation. Values greater than 500 have been rounded to the nearest 1,000 and values less than 500 have been rounded to the nearest 100 to reflect the level of uncertainty that is associated with these estimates (https://www.workzonesafety.org/crash-information/work-zone-injuries-injury-property- damage-crashes/, accessed on September 5, 2019). 4. FHWA Work Zone Facts and Statistics (https://ops.fhwa.dot.gov/wz/resources/facts_stats.htm#ftn5, accessed on September 5, 2019)