Vagabond Shark

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One third of Portland’s morning traffic comes from outside Portland

Posted by Peter W on August 9, 2007

I just got copies of the results of a study by the Portland Department of Transportation (PDOT) which shows that during morning rush hour, up to 35% of traffic (in terms of vehicles*miles) on Portland arterial streets originates from outside Portland. This is an important thing to know when setting goals for reducing the number of auto trips and increasing bike or transit trips, and illustrates that TriMet, the BTA, PDOT, and the City of Portland will ultimately need help from the cities/suburbs and counties outside Portland in order to decrease auto traffic in Portland. Without working with others in the region to promote cycling and transit, I wonder if getting Portlanders on bikes, busses, or trains will just result in more suburbanites finding it easier to drive downtown?

Thanks to Janel from PDOT for passing this on!

Below are graphics and links to the corresponding larger files.


Non-City AM Traffic on City Roads
Model of AM suburban traffic in Portland
Large Image, PDF (750K)

Non-City PM Traffic on City Roads
Model of PM suburban traffic in Portland
Large Image, PDF (750K)

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