Cable Median Barrier Program in Washington State - June 2013
This report documents the evolution and accomplishments of WSDOT’s cable median barrier program and includes updated collision performance analyses. View report.
Performance Analysis of Centerline and Shoulder Rumble Strips Installed in Combination in Washington State - April 2013
This study evaluates the effectiveness of centerline and shoulder rumble strips installed in combination under a variety of traffic and geometric conditions.
Performance Analysis of Centerline Rumble Strips - March 2011
This study evaluates the effectiveness of centerline rumble strips under a variety of traffic and geometric conditions.
Through, Over, or Under Guardrail Penetration by Guardrail Height - December 2009
This report evaluates whether a clear correlation between guardrail height and penetration of the guardrail exists in the collision and roadside features inventory datasets available for Washington State.
(2009) Cable Median Barrier
Reassessment and Recommendations Update - October 2009
This report updates last year’s with 2008 collision data and fulfills our commitment to continue monitoring the performance of cable median barriers for two years.
(2008) Cable Median Barrier
Reassessment and Recommendations Update - September 2008
This report covers our commitment to continue monitoring the performance of cable median barriers for two years following the independent review and recommendations made by Dr. Malcolm Ray in 2007.
(2007) Cable Median Barrier
Reassessment and Recommendations Update - June 2007
This report contains a detailed review of the fatal collision on I-5 in Marysville on Feb. 13, 2007, statewide cable median barrier performance and other cross-median collisions on I-5 in Marysville.
Deception Pass Log Rail Report - November 2004
A final report has been submitted to the Transportation Research Board (TRB) on the Deception Pass Log Rail and is available with video clip.
View the final report and video clip
In-Service Performance of Guardrail Terminal Treatments - June 2004
This research study was conducted to evaluate the in-service performance of existing guardrail end treatments and unrestrained pre-cast concrete barrier in Washington State.
Washington State Cable Median Barrier In-Service Study - November 2003
November 2003 submittal for presentation at the 83rd Annual Meeting of the National Transportation Research. The paper presents WSDOT's experience with Cable Median Barrier on three locations for about 24 miles.
View the submittal.
Median Treatment Study of Washington State Highways - March 2002
A study of across the median crashes on Washington’s multilane, divided state highways was conducted to evaluate median barrier guidelines and identify specific highway sections where installation of a barrier may be desirable.
SR 5 Weaving Analysis (Olympia, WA) - October 2001
Analyze the effectiveness of different modeling techniques and tools in assessing weave section performance and forecasting. Use the tools to analyze an existing weave section that is exhibiting operational problems.