Seattle has not yet installed a protected intersection, which is becoming a standard street improvement in many cities, but it's preparing to add its first at Thomas Street and Dexter Avenue N. (Ryan Packer)

After years of delays, Seattle is finally set to try out a pedestrian and bike safety countermeasure that’s been shown to provide big gains. The Seattle Department of Transportation (SDOT) has started soliciting bids for a long-delayed corridor improvement project in South Lake Union that will construct the first protected intersection in the entire city.

Protected intersections, which add more separation for people walking and biking by adding corner islands that slow down motorists, have become widely recognized as providing safety gains. But even as cities like Minneapolis, Portland, and Berkeley have added them, Seattle has been slow to incorporate them into its bike lane projects and intersection overhauls.

The planned protected intersection will be at Thomas Street and Dexter Avenue N, the same intersection where Seattle police officer Kevin Dave struck and killed 23-year-old Jaahnavi Kandula in a crosswalk this past January. As reported by PubliCola, Dave was traveling at 74 miles per hour responding to what was believed at the time to be an overdose call. Dave is still employed by the Seattle Police Department, with the King County Prosecutor’s office expected to make a decision on whether to charge him with a crime later this month.

The design for Seattle’s first protected intersection includes a full diverter in the middle of the intersection and four wedges of different sizes to provide a buffer between people walking or biking and people driving. (City of Seattle)

The protected intersection is one element of a corridor improvement project along Thomas Street, one that Mayor Bruce Harrell diverted funding away from in his first budget last fall. As a result, instead of a permanent diverter plaza at 5th Avenue N, city crews will instead construct a quick-build plaza with some street furniture separately from the work being bid closer to Dexter Avenue N. Funds to fully upgrade this to something lasting and more durable will need to be found elsewhere. But for now, the plaza will serve its primary function of diverting vehicle traffic trying to use Thomas Street as a cut through. Both the temporary plaza and the permanent improvements around Dexter are set to be installed this fall, barring delays.

A temporary plaza at 5th Avenue N will take the place of a more permanent set of improvements here, with the street closure between 5th Avenue N and the alleyway serving as a diverter for several blocks of the corridor. (City of Seattle)

A revamp of Thomas Street has been in the works for many years. The city’s 2014 Bicycle Master Plan identifying it as an important east-west corridor connecting Seattle Center with key north-south bike routes like Dexter Avenue N, 9th Avenue N, and Eastlake Avenue E. A 2013 concept plan had outlined way that street frontages could be upgraded as part of a “green street” designation, but that plan fell short of taking advantage of the opportunities available on the street.

In 2019, outgoing Councilmember Sally Bagshaw, along with her legislative aide Dan Strauss, hosted a “charrette” to create an up-to-date design. Adding a protected intersection at Dexter came out of that process as a primary design element, as did the idea of closing Thomas Street to through traffic just east of the Seattle Center, creating a pedestrian plaza that will also function as a diverter for a wide swath of the street.

The decision to create Seattle’s first protected intersection at Thomas Street and Dexter Avenue N came out of a 2019 charrette that looked at how to leverage corridor wide improvements to connect people to and from the Seattle Center. (City of Seattle)

The first mayor to divert funding for the project was Jenny Durkan, with Thomas Street included in a long list of projects put on pause in mid-2020 when city revenues were in free-fall. That fall, the city council passed a budget amendment specifically allocating $777,000 to the project. When Mayor Harrell cut funding for the project yet again last fall, SDOT reconfigured the design to be able to take advantage of existing funds.

The fact that Seattle hasn’t joined other forward-thinking cities in implementing protected intersections at all, much less broadly across its bicycle safety projects, is notable. Nearby Bellevue, making steady gains in expanding its protected bike lane network, built its first protected intersection in the Spring District nearly three years ago.

Bellevue’s protected intersection at Spring Boulevard and 120th Avenue NE, the first in the Seattle area, opened in late 2020. (Ryan Packer)

The National Association of City Transportation Officials (NACTO) has included protected intersections in their urban bikeway design guide for many years now, including the concept centrally in their bluntly named design manual Don’t Give Up at the Intersection. But many of Seattle’s latest proposals for key segments of the bike network aren’t including any intersection protection at all, with separated signal phases keeping people on bikes away from drivers turning left or right even becoming a luxury in Seattle’s bike projects.

Hopefully Seattle’s first protected intersection will not remain a novelty for long.

Thomas Street in South Lake Union To Get Traffic Diverter, Protected Intersection
Article Author
Ryan Packer
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Ryan Packer lives in the Summit Slope neighborhood of Capitol Hill and has been writing for the The Urbanist since 2015. They report on multimodal transportation issues, #VisionZero, preservation, and local politics. They believe in using Seattle's history to help attain the vibrant, diverse city that we all wish to inhabit. Ryan's writing has appeared in Capitol Hill Seattle Blog, Bike Portland, and Seattle Bike Blog, where they also did a four-month stint as temporary editor.