• Major Project

I-405/SR 167 Corridor Program

A map showing the  I-405/SR 167 Corridor.

Major Project overview

The I-405/SR 167 Corridor Program stems from the I-405 Master Plan and SR 167 Corridor Plan, foundational documents that guide project development, funding and delivery. The I-405 Master Plan alone includes over 150 projects designed to improve travel between Lynnwood and the Renton/Tukwila area. When combined with SR 167, this north-south corridor forms a 50+-mile transportation system providing travelers with a reliable trip in the express toll lanes, regular lanes and high-capacity transit (bus rapid transit).

Timeline overview

We delivered the first project in 2005, 15 additional projects by 2015 and continue towards construction readiness on funded projects.

Major project status



Estimated $4B of funded corridor improvements

Major project alerts

I-405/SR 167 Corridor Communications

Current construction activities

Under the guidance of the I-405 Master Plan and the SR 167 Corridor Plan, the I-405/SR 167 Corridor Program team currently has four major projects under construction. Currently under construction is the I-405, Renton to Bellevue Widening and Express Toll Lanes project between Renton and Bellevue, the SR 167 Corridor Improvements project between Tukwila and Auburn, the I-405, Brickyard to SR 527 Improvement project in Bothell, and the I-405, Northeast 85th Street Interchange project in Kirkland. Learn about what we have accomplished recently by viewing our 2023 Year in Review

Overall benefits of the I-405/SR 167 Program

The projects currently in design and under construction build on $1.8B of successful project delivery on this 50+ mile corridor. WSDOT continues to partner with local communities and transit agencies to deliver the vision set forth in the I-405 Master Plan and SR 167 Corridor Plan. When fully realized, corridor travelers will experience multimodal improvements that provide benefits to all users, while addressing failing infrastructure, opening upstream fish habitat, and connecting communities, freight, and Regional Growth Centers throughout the corridor.

Express toll lanes offer benefits for all travelers

Express toll lanes better use the existing highway lanes and provide drivers with a more reliable trip. These lanes use dynamic toll rates, which change based on real-time demand and congestion. The toll you see when you enter the lane is the price you will pay for the trip. The I-405 and SR 167 express toll lanes will connect the entire corridor with a system better equipped to manage traffic demands in the future.

WSDOT is building express toll lanes on I-405 and SR 167 because they:

  • Operate efficiently, moving more people and offering a more reliable trip.
  • Manage demand to improve speed and reliability.
  • Strategically add capacity to increase throughput.
  • Reduce congestion, improving mobility for transit, freight, and drivers in all lanes.
  • Generate revenue for future corridor improvements by charging a user fee for non-carpool vehicles to use the express toll lanes.

Once the SR 167 Corridor Improvements project is complete, drivers will experience transformed and modernized SR 167 express toll lanes. The future SR 167 express toll lanes will tie into the I-405 express toll lane system from Renton to Bellevue, currently under construction, and the express toll lanes to Lynnwood which opened to the public in 2015. These projects form the 40-mile I-405/SR 167 Corridor ETL system that benefits both transit and drivers with a faster, more reliable trip.

When complete, the southern end of SR 167 will connect with the Puget Sound Gateway Program.