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I-405 is one of the most congested corridors in the state, serving an area that is exceeding regional population growth estimates.
The express toll lanes between Bellevue and Lynnwood have helped improve traffic and provided new transportation options for the north end of the I-405 corridor. There are currently two express toll lanes in each direction between NE Sixth Street in Bellevue and just south of the SR 522 interchange in Bothell, and a single lane between SR 522 and I-5. This single-lane section continues to experience congestion, particularly southbound in the morning commute, because there is not enough roadway capacity to keep up with demand.
Consistent with the long-term Master Plan for the corridor, WSDOT is moving forward with additional improvements to mobility and reliability on I-405 in Bothell and south Snohomish County.
The I-405, SR 522 Vicinity to SR 527 Express Toll Lanes Improvement Project would:
These improvements will help support a reliable trip for travelers in all lanes, including riders of Sound Transit’s new I-405 Bus Rapid Transit system, planned to open in 2025.
In 2019, the Legislature fully funded this project through their direction to use toll revenue and bonding.
I-405/SR 167 Corridor Communications
425-450-2580
I405SR167Program@wsdot.wa.gov