The SR 99 Tunnel in Seattle is currently toll free, but tolls will begin on November 9, 2019 at 5 a.m.
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Tolls on the SR 99 Tunnel are calculated based on the number of axles for your vehicle. When counting axles, make certain to count the axles with wheels on the ground, including any axles on trailers you may be towing.
There are 5 axle designations for Washington.
When calculating a toll, the following options will be available in the calculator's drop-down menu:
Count each axle with wheels on the ground.
More detailed vehicle class information may be found on the Toll Payments page.