barriers

WA-RD 266.1
Authors: 
James D. Chalupnik, Donald S. Anderson.
Originator: 
Washington State Transportation Center (TRAC)
Publication Date: 
Wednesday, April 1, 1992
WA-RD 304.1
Authors: 
Louis F. Cohn, Roswell A. Harris
Originator: 
University of Louisville. Dept. of Civil Engineering.
Publication Date: 
Sunday, January 31, 1993
WA-RD 489.1
Authors: 
Peter H. Singleton, John F. Lehmkuhl.
Originator: 
Pacific Northwest Research Station (Portland, Or.). Wenatchee Forestry Sciences Lab.
Publication Date: 
Monday, May 15, 2000
WA-RD 651.1
Authors: 
Carter Burgess, Wilbur Smith Associates, Resource Group Inc., Perteet, EnviroIssues, IBI Group, IBI Group, Demich Consulting.
Originator: 
Carter Burgess.
Publication Date: 
Sunday, October 1, 2006