I-405 Widening Ready to Launch Outside Seattle

A major road-widening project will begin construction next year. The project is a long time coming for a fast-growing region, but the final product will reflect a new approach to highway funding.

1 minute read

September 11, 2018, 2:00 PM PDT

By James Brasuell @CasualBrasuell


Interstate Freeway System

Mark Payne / Shutterstock

Mike Lindblom reports on an impending highway widening project along 11 miles of Interstate 405 to the east of Seattle, connecting King County cities like Renton, Bellevue, and Woodinville.

The $1.2 billion project will use funding from a gas-tax increase implemented in 2003. "But if commuters hope to drive faster, they’ll need to pay again — because most of the new highway space will be express toll lanes," according to Lindblom. "The design adds one express toll lane and converts the free carpool lane to express tolls, alongside the existing two or three general lanes each way between Renton and Bellevue."

Lindblom also notes that several interchanges will be improved to alleviate logjams.

The new space on the highway will also be devoted to transit. "Sound Transit will create an 11-stop bus-rapid transit (BRT) network from Lynnwood to Burien, spending roughly $1 billion for passenger stations, highway ramps, buses and park-and-ride garages," according to Lindblom.

The article includes more details about the project, the expected impact of the changes on commuters in the region, and the politics of highway spending and tolling.

I-405 - Renton to Bellevue Widening and Express Toll Lanes (WSDOT)
portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

Concrete Brutalism building with slanted walls and light visible through an atrium.

What ‘The Brutalist’ Teaches Us About Modern Cities

How architecture and urban landscapes reflect the trauma and dysfunction of the post-war experience.

February 28, 2025 - Justin Hollander

Complete Street

‘Complete Streets’ Webpage Deleted in Federal Purge

Basic resources and information on building bike lanes and sidewalks, formerly housed on the government’s Complete Streets website, are now gone.

February 27, 2025 - Streetsblog USA

Green electric Volkswagen van against a beach backdrop.

The VW Bus is Back — Now as an Electric Minivan

Volkswagen’s ID. Buzz reimagines its iconic Bus as a fully electric minivan, blending retro design with modern technology, a 231-mile range, and practical versatility to offer a stylish yet functional EV for the future.

March 3, 2025 - ABC 7 Eyewitness News

View of mountains with large shrubs in foreground in Altadena, California.

Healing Through Parks: Altadena’s Path to Recovery After the Eaton Fire

In the wake of the Eaton Fire, Altadena is uniting to restore Loma Alta Park, creating a renewed space for recreation, community gathering, and resilience.

6 hours ago - Pasadena NOw

Aerial view of single-family homes with swimming pools in San Diego, California.

San Diego to Rescind Multi-Unit ADU Rule

The city wants to close a loophole that allowed developers to build apartment buildings on single-family lots as ADUs.

March 9 - Axios

Close-up of row of electric cars plugged into chargers at outdoor station.

Electric Vehicles for All? Study Finds Disparities in Access and Incentives

A new UCLA study finds that while California has made progress in electric vehicle adoption, disadvantaged communities remain underserved in EV incentives, ownership, and charging access, requiring targeted policy changes to advance equity.

March 9 - UCLA Luskin Center for Innovation