UW’s Mark Hallenbeck explains why WSDOT can’t measure I-405 diversion traffic

KUOW radio interviewed Mark Hallenbeck to report on how mobile apps are creating diversion traffic on neighborhood streets. This story is exactly what is happening due to the #405ETL.


WSDOT doesn’t measure traffic on these neighborhood streets; only on the arterial streets. As a result, in WSDOT’s mind, there is no diversion traffic caused by the I-405 Express Toll Lanes. And this is the (unintentional?) lie that they are reporting to legislators.

This 10 minute news article was originally broadcast July 20, 2017 on Here & Now.
Mark Hallenbeck is the director of the Washington State Transportation Center (TRAC) at the University of Washington.  So Mark, while I was first pointing this out nearly 2 years ago, why were you siding with WSDOT?

Posted in Uncategorized
2 comments on “UW’s Mark Hallenbeck explains why WSDOT can’t measure I-405 diversion traffic
  1. […] the back roads that avoid the arterials, which is where WSDOT measures diversion traffic. (See my article about NPR’s story with a link to the NPR audio)   That the tolls continue to reach $10 on a regular basis and […]


  2. […] erratic striping, uneven pavement and construction activity. 6. Diversion traffic. As described by Mark Hallenbeck from UW Transportation department and confirmed by Inrix data, mobile apps are guiding drivers to use side […]


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