Seattle-Tacoma crash statistics and trends

Seattle and Tacoma sit at opposite ends of the same crash problem: heavy commuter volumes squeezed onto a handful of arterials and interstates built for a smaller region. The numbers back that up, and so does a look at exactly which streets keep showing up in agency reports.

How many people are dying on the roads here

Washington recorded 731 traffic deaths in 2024, a 9.6 percent drop from the 809 deaths counted in 2023, the highest total the state had seen in more than three decades.¹ Statewide, impaired driving was a factor in 348 of those 2024 deaths (48 percent), speeding in 247 (34 percent), and distracted driving in 138 (19 percent), with heavy overlap between categories.² Motorcyclists accounted for 113 deaths and pedestrians 155, both slightly down from 2023.²

King and Pierce counties, which make up most of the Seattle-Tacoma market, didn't share equally in that improvement. King County recorded 140 traffic deaths in 2024, down 7.3 percent from 151 in 2023 (itself up 3.4 percent from 146 in 2022).¹ Pierce County recorded 94 deaths in 2024, essentially flat against 95 in 2023, which had been a 10.5 percent jump from 85 in 2022.¹ More than half of all fatal crashes statewide in 2024 happened in just five counties: King, Pierce, Snohomish, Spokane, and Yakima.¹

Pedestrians and cyclists absorbed a disproportionate share of that toll. Walker and roller fatalities in King County fell to 52 in 2024 from 60 in 2023, but Pierce County's rose to 30 from 21, a 42.9 percent jump.¹ Half of all pedestrian and cyclist deaths statewide in 2024 occurred in just King and Pierce counties.¹

Rainier Avenue South, rebuilt after a decade of crashes

Rainier Ave S in southeast Seattle is the case study Seattle transportation planners point to most often. Between S Alaska St and S Kenny St, the corridor averaged 95 collisions a year for the decade before 2015, including roughly one fatal crash and nine serious-injury crashes a year.³ In August 2015, the Seattle Department of Transportation converted the four-lane street to three lanes with a center turn lane, added transit priority signals, and lowered the speed limit.³ Afterward, total collisions on that stretch fell 15 percent, injury collisions fell 30 percent, and pedestrian and bicycle collisions fell 40 percent, while serious-injury collisions dropped to zero.³ Speeding fell just as sharply: the share of northbound drivers exceeding the limit dropped from 84.1 percent to 40 percent, and the share going more than 40 mph fell from 4.1 percent to 0.8 percent.³

The work on Rainier isn't finished. On the segment SDOT calls the Rainier Ave S Connection, the corridor logged 136 crashes between 2021 and 2025, including six serious injuries, even with a posted 25 mph limit that 79 percent of drivers ignore, routinely topping 35 mph.⁴

Aurora Avenue North, where a fifth of the city's traffic deaths happen

If Rainier is Seattle's rebuilt corridor, Aurora Ave N, which carries State Route 99 through north Seattle and into Shoreline, is the one still waiting its turn. Between 2018 and 2022, crashes on Aurora's roughly 7.6-mile stretch between the SR 99 tunnel's north portal at Roy St and N 145th St accounted for 19 percent of all traffic fatalities citywide, on a street that represents a small fraction of Seattle's total road mileage.⁵ Pedestrians were involved in only 6 percent of Aurora's crashes but made up 70 percent of the deaths.⁵ Posted speeds run 30 to 40 mph, and SDOT's own study found it's common for drivers to go 3 to 5 mph over that, with some routinely reaching 15 to 20 mph over.⁵ The corridor is also missing about 1.8 miles of sidewalk, concentrated north of N 115th St, and carries the region's highest-ridership bus line, Metro's RapidRide E Line, alongside 1,100 to 1,500 daily truck trips.⁵ SDOT and King County Metro are now running a joint planning study to redesign it.⁵

Crashes outside the city limits

Not every dangerous mile sits inside Seattle or Tacoma proper. On county-maintained roads in unincorporated King County, the Road Services Division logged 1,682 collisions in 2023: 9 fatal, 518 causing injury, and 1,155 property-damage-only, at an estimated economic cost of $50.7 million.⁶ Twenty of those crashes involved a pedestrian, and across the six years of data the report tracks, the most commonly identified specific factor was a driver failing to yield the right of way to someone on foot.⁶

Tacoma and Pierce County catch up on Vision Zero

Tacoma committed to eliminating traffic deaths and serious injuries by 2035 when the city council passed Resolution 40559 in 2020.⁷ The city's 2024 and 2025 road safety audits targeted a specific list of high-injury streets:

• South Tacoma Way, S 62nd St to S 47th St
• South Yakima Avenue, S 25th St to S 8th St
• South Pine Street, S 47th St to Center Street
• South 72nd Street, S Sheridan Avenue to A Street
• 6th Avenue, Jackson Avenue to Pearl Street
• South 12th Street, S Union Avenue to S Sprague Avenue⁷

In January 2023, Tacoma dropped residential speed limits to 20 mph citywide and lowered arterial speeds from 30 to 25 mph in four business districts: 6th Avenue, Old Town, McKinley Hill, and Lincoln.⁷

Pierce County followed with its own Vision Zero Action Plan, adopted by the county council on April 29, 2025 under Resolution R2025-132 after a contested 4-3 vote.⁸ The plan's starting point was stark: 108 people killed and 296 seriously injured on unincorporated Pierce County roads between 2018 and 2022.⁸

What agencies are doing about it

Seattle's current Vision Zero Action Plan, updated in May 2024, is backed by $162 million from the city's Transportation Levy plus a $25.6 million federal Safe Streets for All grant, funding new head-start walk signals, no-turn-on-red restrictions, protected bike lanes, and crossing upgrades on corridors including MLK Jr Way, Rainier Ave S, Beacon Ave S at 15th Ave S, and the Ballard Bridge approach on 15th Ave NW.⁹ SDOT reports that leading pedestrian intervals, which give people a head start into the crosswalk, have cut the number of pedestrians hit by turning vehicles by nearly half at the intersections where they've been installed, and that the citywide shift to 25 mph arterials produced an initial 17 percent drop in injury risk.⁹ Even so, fatalities remain above where they stood when Seattle launched Vision Zero in 2015, despite a decline since a 2021 peak.⁹

Farther south, WSDOT's I-405/SR 167 Corridor Program is building a 40-mile express toll lane system between Renton and Bellevue that ties into a roughly 50-mile managed-lane network stretching from Lynnwood to Puyallup, aimed at the chronic congestion on the Tacoma-Seattle commute.¹⁰

If you're dealing with a crash on one of these roads

None of this changes how a claim gets handled, but it explains why insurers and city attorneys treat certain stretches differently. Rainier Ave S, Aurora Ave N, and the high-injury streets in Tacoma all have documented crash histories that adjusters and investigators already know about. If you were hurt in a crash and need help sorting out fault or a claim, an attorney who works these corridors regularly can be more useful than a generalist. You can find one through the legal directory.

This article is general information, not legal advice.

Sources

1. Washington Traffic Safety Commission, "State of the State: Washington Traffic Fatalities," Brief No. 11, October 2025. https://wtsc.wa.gov/wp-content/uploads/dlm_uploads/2025/10/11_State-of-the-State_Oct2025.pdf

2. Washington Traffic Safety Commission, "Preliminary Traffic Fatality Numbers for 2024 Decrease from 33-Year High in 2023," May 28, 2025. https://wtsc.wa.gov/20555-2/

3. Seattle Department of Transportation, "Rainier Avenue South Safety Corridor: Rainier Pilot Project Evaluation." https://www.seattle.gov/documents/Departments/SDOT/MaintenanceProgram/RainierAveS_BeforeAfter.pdf

4. Seattle Department of Transportation, "Rainier Ave S Connection." https://www.seattle.gov/transportation/projects-and-programs/safety-first/vision-zero/projects/rainier-ave-s-connection

5. Seattle Department of Transportation and King County Metro, "Aurora Ave N Corridor Planning Study (Phase 1): Executive Summary," June 2025. https://www.seattle.gov/documents/Departments/SDOT/Projects/Aurora%20Ave%20Project/Aurora_Study_Ph_1_Executive%20Summary_Final_2025_06_18.pdf

6. King County Department of Local Services, Road Services Division, "2023 Collision Data Report," September 24, 2024. https://cdn.kingcounty.gov/-/media/king-county/depts/local-services/roads/plans-reports/2023kingcountycollisiondatareport.pdf

7. City of Tacoma, "Vision Zero." https://tacoma.gov/government/departments/public-works/vision-zero/

8. Pierce County, Washington, "Vision Zero." https://www.piercecountywa.gov/8182/Vision-Zero

9. Seattle Department of Transportation, "Clear direction to prevent serious crashes in Seattle: Vision Zero Action Plan update," SDOT Blog, May 16, 2024. https://sdotblog.seattle.gov/2024/05/16/vision-zero-action-plan/

10. Washington State Department of Transportation, "I-405/SR 167 Corridor Program." https://wsdot.wa.gov/construction-planning/major-projects/i-405sr-167-corridor-program