What’s happened to traffic since SR 99 tunnel tolling started 

Crossposted from Metro Matters 

One month after tolling began in the State Route 99 tunnel, we’re getting our first few weeks of traffic data. While it’s still early, SR 99 tunnel usage remains high and exceeds forecasts. Traffic volumes were within normal ranges on I-5 and ridership on King County Metro Transit remained consistent. 

Initial information from Seattle-area transportation partner agencies reflects weekday data between Nov. 12 and Nov. 22. (Thanksgiving week was excluded as it is an unusual travel week). Traffic patterns vary and we expect they will continue to change as drivers look for best routes to reach their destinations. 

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