Seattle plans to install four automatic speed cameras in 2027 on E Marginal Way S, Sand Point Way NE and two sections of Rainier Avenue S. The cameras are expected to operate around the clock, extending speed-camera enforcement beyond school zones for the first time, The Urbanist reports.
The four locations were selected on corridors with histories of fatal and serious crashes and persistently high speeds, according to The Urbanist. At the sites, 15% of drivers were recorded traveling at least 10 mph over the speed limit. On Sand Point Way NE, where the limit is 30 mph, reported 85th-percentile speeds range from 35 to 40 mph.
A first phase of a larger expansion
The planned cameras are the first phase of a broader expansion announced by Mayor Katie Wilson. An executive order issued Aug. 21, 2026, commits Seattle to adding 10 speed cameras by early 2029, The Urbanist reports.
The city says it intends to direct enforcement toward areas with the greatest safety needs while avoiding an excessive concentration of cameras in historically disadvantaged neighborhoods. SDOT says its camera-location process considers safety, equity, inclusive community engagement and input from city program partners.
What drivers should expect
Seattle already uses automated cameras for red-light enforcement, bus-only lanes and intersection blocking. In a spring 2025 update, the Seattle Department of Transportation reported 23 red-light-camera intersections, six bus-lane camera locations, six block-the-box camera intersections and 19 school-zone speed-camera areas.
All new traffic-safety cameras must operate under a 30-day warning-only period before violations are issued, SDOT says. The department also says net revenue from its automated traffic-camera safety fund will be invested in safety and accessibility improvements.
The earlier results are a reference, not a forecast
Seattle's school-zone program offers the city's main published benchmark, but it is a separate enforcement setting. SDOT reports a 71% reduction in crashes in areas where school speed-zone cameras are active and a 64% reduction in daily traffic violations per school speed-zone camera location.
Those figures describe reported outcomes around school-zone cameras; they do not establish how the four planned 24/7 cameras will perform. The available SDOT account does not provide a comparable evaluation of the planned sites, so questions about crash effects, violation levels and distributional impacts remain open.
SDOT reported that Seattle had 19 school safety zones with speed cameras in spring 2025 and planned to increase that number to 38 later that year. The 2027 corridor installations would represent a policy shift in where and when the city applies automated speed enforcement, but the city has not yet published results for those future locations.
Why speed matters
The safety rationale is tied to the relationship between vehicle speed and pedestrian injury severity. The Insurance Institute for Highway Safety reports that a pedestrian struck at 20 mph faces an 18% risk of serious injury, compared with 67% at 35 mph.
That evidence helps explain the focus on corridors where measured speeds exceed posted limits. It does not, by itself, demonstrate that cameras will reduce crashes at the Seattle sites; that conclusion will require location-specific monitoring after installation.
