Margiotta, Richard A., author.
Washington, DC : U.S. Department of Transportation, Federal Highway Administration, Office of Operations, July 2012.
2012-
Dowling, Richard G. (Richard Gerhard), author.
Washington, DC : U.S. Department of Transportation, Federal Highway Administration, Office of Operations, 2013.
2013
Dowling, Richard G. (Richard Gerhard), author.
Washington, DC : United States Department of Transportation, Federal Highway Administration, February 2015.
2016-