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.