I-405 - SR 167 Interchange Direct Connector Project - Complete February 2019

Project news

Through this project, WSDOT built a new flyover ramp connecting the HOT lanes on SR 167 to the carpool lanes on I-405 in Renton. This ramp is designed to improve traffic flow and safety at this critical interchange. 

Why did WSDOT build this new flyover structure?
Traffic analyses shows that this project significantly decreases the hours of delay travelers experience in this area. The new connection also reduces weaving at this interchange and on SR 167 and I-405, making collisions less likely.

The End Result
The I-405/SR 167 flyover ramp is the first phase of a broader project, the I-405 Renton to Bellevue Widening and Express Toll Lanes Project. Once the Renton to Bellevue Project is open, single occupancy drivers will pay a toll to drive the flyover ramp. This critical flyover link will ultimately connect 25 miles of express toll lanes on I-405 with 15 miles of HOT lanes on SR 167, resulting in a 40-mile express toll lane system.

Needs and benefits

  • Congestion relief and safety: This project improves traffic flow and decreases the likelihood of collisions by keeping traffic moving within the proposed express toll lane system. This highway-to-highway connection solves weaving issues associated with drivers exiting the carpool or HOT lanes, merging onto I-405 or SR 167, and merging across traffic again to the HOT toll lanes. The result is improved operations for both general purpose lanes and carpool or express toll lanes, providing benefits for all travelers, including transit.
  • Environment: This project created better opportunities for drivers to use the SR 167 HOT lanes. Operating express toll lanes results in more reliable speeds and optimal lane performance, thus creating environmental benefits. By improving transit operations, increasing transit and carpool ridership, and improving traffic flow, we can decrease air pollution and greenhouse-gas emissions. This project also installed a noise wall, built stormwater management facilities, and upgraded or replaced stream crossings at I-405 and SR 167 to promote fish passage.
  • Economic stimulus: This project provides better transit access to affordable housing and employment centers. It also improves congestion, expanding freight mobility to the Green River Valley cities' warehousing and distribution centers. A major construction project like this one created hundreds of jobs quickly across numerous trades.


  • April 2008: WSDOT published the Tukwila to Renton Improvement Project Environmental Assessment (EA).
  • July 2008: The Notice of Availability for the Finding of No Significant Impact (FONSI) for the Tukwila to Renton Improvement Project was published.
  • Winter 2013/14: Complete Environmental Assessment re-evaluation.
  • January 2015: Complete preliminary engineering, right-of-way work.
  • July 2015: This project was funded by the Connecting Washington transportation package. 
  • June 2016: Guy F. Atkinson Construction, LLC of Renton submitted the apparent best value proposal of $115.9 million to complete design and construction for the Direct Connector project.
  • September 2016: WSDOT held a ceremonial groundbreaking for this project on Sept. 29, 2016. View photos on Flickr.
  • February 2019: WSDOT held a ribbon-cutting event for this project on Feb. 19, 2019.
  • Mid-2019: Project completion


Financial Data for PIN 140504C, 140504K
Funding Source Amount ($ in thousands)

  • 2005 Gas Tax (TPA) - $41,614
  • Pre-Existing Funds (PEF) - $346
  • CWA - $154,653
  • Total - $196,613


I-405/SR 167 Corridor Communications

The Washington State Department of Transportation is a public agency and is subject to the State of Washington’s Public Records Act (RCW 42.56). Therefore, public comments and questions may be made available to anyone requesting them for non-commercial purposes.

I-405 - SR 167 Interchange Direct Connector Project Location Map Thumbnail

I-405/SR 167 Interchange Direct Connector flyover ramp
The I-405/SR 167 Interchange Direct Connector flyover ramp (looking west from the I-405 approach).