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Washington State DOT (WSDOT) produces an annual report called The Gray Notebook, in order to evaluate their performance measurements for their highway system. The 2010 Congestion Report focuses on data comparisons between 2007 and 2009 highway capacity, usage and delay statistics. WSDOT worked to improve the operational efficiency of Washington's highways through ITS deployments such as variable speed limits, dynamic message signs, high occupancy tolling (HOT) lanes, and incident response teams, as well as through strategic expansion of roadways at reoccurring bottlenecks. The authors note that some of their findings may have been impacted slightly by the annual VMT per capita decrease of 300 miles (1.6 percent) between 2007 and 2009, a likely result of the recession and high gasoline prices.

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Washington State DOT
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The Congestion Report Gray Notebook Special Edition WSDOT’s comprehensive analysis of system performance on state highways,
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