I-405 Northbound Peak Use Shoulder Lane Project, SR 527 to I-5
News & project updates
May 24, 2017
The northbound shoulder lanes opened to the public on April 24!
Why did WSDOT build this project?
Northbound I-405 experiences heavy congestion, especially in the Bothell area during the afternoon commute. With funding from I-405 toll revenue, the Washington State Department of Transportation built new capacity between State Route 527 and I-5 to help relieve congestion.
What peak shoulder use looks like
The end result
This project's primary focus was building a new northbound peak use shoulder lane, which adds new capacity for general purpose traffic. The new lane extends for about 1.8 miles between SR 527 and I-5.
WSDOT will also construct one new noise wall along northbound I-405.
Overhead lane control signs display whether the peak use shoulder lane is open to traffic. The lane is generally open to traffic during the peak afternoon commute (3 to 7 p.m.). Vehicles over 10,000 gross vehicle weight are prohibited from using the lane, with the exception of buses.
By building more capacity to handle the large volumes of traffic entering I-405 from SR 527, we expect to improve congestion that travelers are experiencing, especially in the area near the SR 522 interchange, where I-405 has less capacity.
The I-405 project office is evaluating additional longer-term projects to provide benefits in the area between SR 522 and I-5.
What is the project timeline?
Contract awarded: November 2016 to Graham Contracting Ltd.
Construction start: January 2017
Open to traffic: Spring 2017