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Lerner, Neil D, Neuman, Timothy R, Slack, Kevin L, Hardy, Kelly K, Sohn, Jamie, Goodwin, Arthur H, Foss, Robert D, Potts, Ingrid B, Harwood, Douglas W, Raborn, Craig, Pfefer, Ronald, Torbic, Darren John, Bond, Vanessa L, Transportation Research Board. "Objective D - Communicate Appropriate Speeds through Use of Traffic Control Devices." NCHRP Report 500 Volume 23: A Guide for Reducing Speeding-Related Crashes. Washington, DC: The National Academies Press, 2009.

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