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Transportation Final 10-15-11 -   3.1 - Before and After Results From Mobility Projects

 
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Transportation Final 10-15-11
1. Safety
2. Preservation
3. Mobility
4. Ferries
5. Stewardship
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?

 
 
 
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Data Notes
Data Source: WSDOT Transportation Data Office; WSDOT Systems Analysis and Program Development Office
Measure Definition: Total daily travel times through project segments prior to and following construction.
Target Rationale:
Link to Agency Strategic Plan: Objective 3.1: Add capacity strategically.
Relevance:

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

 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-seven highway safety projects completed between October 2004 and September 2006 found that these projects reduced all types of collisions by 3.4% and injury/fatal collisions by 20% along identified high risk locations. 

Follow-up study of 15 additional projects shows that WSDOT congestion relief projects continue to improve travel times for commuters during peak periods

  • A before and after analysis of 15 completed Nickel and TPA projects statewide showed a 7 MPH average improvement in travel speeds during peak periods with improved travel times by up to 2.5 minutes. For all 15 projects, commute times through these project segments improved by 15% (1 minute savings on average). The improvements occurred despite the fact that volumes increased by 14% on these segments.