They sliced the data from the American Community Survey of the US Census and created a map showing walking to work magnitudes. By clicking through to an individual city, you can see the entire mode split.
By percent, more people walk to work in Salem than in Portland. Corvallis has the highest rate in Oregon.
The bike commute numbers are also included on the captions - but not the dots on the map.
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Here's the morning rush hour traffic volumes. It's pretty easy to see that outside of the Front/Liberty/Commercial and Marion/Center clusters, there's plenty of roadway to use more efficiently and more creatively.