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WA-RD 732.1
Authors: 
William F. Cofer, Mohamed ElGawady, Steven M. Greenwood.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Friday, August 21, 2009
WA-RD 216.1
Authors: 
Khossrow Babaei, Neil M. Hawkins.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, March 31, 1991
WA-RD 176.1
Authors: 
Donald J. Janssen.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, March 12, 1989