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WA-RD 048.1
Authors: 
Washington (State). Department of Transportation. Traffic Safety Section.
Originator: 
Washington (State). Department of Transportation. Public Transportation and Planning Division.
Publication Date: 
Friday, May 21, 1982
WA-RD 084.1
Authors: 
Harold C. Sorensen, Richard Toreh.
Originator: 
Washington State University. Dept. of Civil and Environmental Engineering. Structural Engineering Section, Washington State Transportation Center (TRAC)
Publication Date: 
Thursday, May 1, 1986