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Another Look at Declining Seattle Traffic

SwatchJunkies

Every year, the Seattle Department of Transportation tracks traffic at 19 select bridges across the city, and presents the resulting traffic count as a rough-and-ready gauge of citywide traffic trends. And based on these counts, SDOT believes that traffic across the city fell by a whopping 10 percent between 2003 and 2012:

Seattle traffic trends
From the 2012 Traffic ReportSeattle Department of Transportation

But it gets more dramatic. The US Census Bureau says that Seattle’s population grew by 11 percent over the same period—suggesting a drop in per capita vehicle travel of more than 20 percent in a single decade.

Meanwhile, transit ridership in Seattle grew by nearly 40 percent from the early 2000s through 2012:

Seattle transit trends
From the 2012 Traffic ReportSeattle Department of Transportation

Of course, these trends are moving slowly enough that most Seattle residents probably don’t notice the changes in their daily lives. In fact, I’d bet that a lot of people stuck in traffic don’t believe that the trends are real. That’s not too surprising, really: when you’re sitting, frustrated, in heavy traffic, it’s very easy to forget that you were also stuck in traffic a decade ago.

Still, the numbers paint a compelling picture of a gradual sea-change in how we get around the city: more transit, less driving. That’s what a slow-motion revolution looks like, folks.

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SwatchJunkies

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Clark Williams-Derry

Clark Williams-Derry focuses on United States and global and energy markets, particularly issues affecting the Western United States.

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Sightline Institute is an independent, nonpartisan, nonprofit think tank providing leading original analysis of democracy, forests, energy, and housing policy in the Pacific Northwest, Alaska, British Columbia, and beyond.

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