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WA-RD 861.2
Authors: 
Peter H. Dahl, David R. Dall'Osto, Jim Laughlin.
Originator: 
Washington State Transportation Center (TRAC).
Publication Date: 
Monday, April 24, 2017
WA-RD 861.1
Authors: 
Per G. Reinhall, Tim Dardis, Julie Hampden.
Originator: 
Washington State Transportation Center (TRAC-UW)
Publication Date: 
Tuesday, November 22, 2016
WA-RD 406.2
Authors: 
William F. Cofer, Sukomal Modak.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Monday, June 30, 1997
WA-RD 406.1
Authors: 
Sukomal Modak, William F. Cofer.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Tuesday, July 1, 1997