condition

WA-RD 015.2
Authors: 
Milan Krukar, John C. Cook.
Originator: 
Washington State University. Highway Research Section.
Publication Date: 
Monday, July 1, 1968
WA-RD 321.2
Authors: 
Robert D. Holtz.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Monday, January 1, 1996
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 321.1
Authors: 
Robert C. Metcalfe, Robert D. Holtz.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Sunday, May 1, 1994