Skip to main content

Transportation Final 4-15-09 -   3.1 Before and After Results From Mobility Projects

Go Search
Transportation Final 4-15-09
1. Safety
2. Preservation
3. Mobility
4. Environment
5. Stewardship
Current Conditions
Action Plan

3.1 Before and After Results From Mobility Projects

What are the before and after results for completed 2003 and 2005 gas tax mobility projects?

Print Version
Progress icon Operation in progress...
Data Notes
Data Source: WSDOT Traffic Office
Measure Definition:
Target Rationale:
Link to Agency Strategic Plan:

Notes: (optional)



Volume information is based on traffic counts and speed information is based on modeled data. These 21 projects are those completed congestion relief projects with the necessary data to support a Before and After analysis as of 6/30/08. WSDOT received funding to purchase additional equipment to perform a greater number of and more precise Before and After studies in the future, and has been actively collecting data this summer.
Also Available
Action Plan: Yes
Extended Analysis: No

 Display Drill Down Measures


 Summary Analysis

In April 2008, Governor Gregoire challenged WSDOT to broaden its reporting of 2003 and 2005 gas tax project outcomes important to Washington citizens; specifically, measuring the results from the driver’s perspective for each completed project.  WSDOT has undertaken an initial assessment of 21 of these congestion relief projects, and continues to report safety results:

  • Twenty-one completed 2003 and 2005 gas tax projects statewide save more than 6,400 hours of travel a day–a 10% improvement.
  • Graph: Performance of 21 projects
  • These improvements in travel time translate into nearly $60 million a year in economic benefits to commuters and businesses.

In addition, an evaluation of forty-nine traffic safety projects completed between October 2003 and September 2005 found that these projects reduced all types of collisions by 6% and injury/fatal collisions by 14% along identified high risk locations.