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LED Stop Sign Upgrade Project
Work began in November 2025
Status update
Crews have begun work to replace stop signs with new solar powered LED stop signs and signals at 17 intersections in unincorporated King County. Please view the selected locations below on the map.
Most of this work will be done without lane restrictions or any impact to the traveling public.
One of two stop signs with flashing, LED lights installed in spring 2021 to address safety concerns at SE Kent-Kangley Road and Landsburg Road SE/SE Ravensdale Way.
Project overview
King County is making roads safer for drivers, pedestrians, and cyclists at 17 intersections. We are removing the old stop signs and overhead flashing lights and installing new, bright LED flashing stop signs. LED stop signs add a dimension of visibility with strobing lights around the outer edge. This means that drivers see them earlier, day and night. We’re also adding yellow LED flashing lights and improved “advance warning” road signs to alert drivers about the upcoming stop sign. The earlier visibility helps ensure vehicles have more time to stop, creating safer conditions for all travelers.
Locations for this project have been identified as high-priority traffic safety improvement sites. Nearly all the new signs will be solar powered.
What to expect during construction
- When work is occurring, access in the intersection will be reduced to one lane and traffic may be controlled with a flagger.
- Work will occur Monday through Friday during between the hours of 7 am and 3:30 pm with later start times and early end times for high volume roadways.
2025 LED stop sign upgrade locations
Some locations have pavement patching or sidewalk panel replacement which is weather sensitive. Scheduled work days are subject to changes based on material or crew availability and weather. Lighting is improved in partnership with Puget Sound Energy.
| Intersection | Community | Intersection Type | Scope of Work | Expected Construction Date |
|---|---|---|---|---|
| 16th Avenue SW & SW 98th Street | White Center | All-way stop (no flasher) | Replace standard stop signs with four solar powered LED stop signs | Completed in November 2025 |
| 59th Avenue S & S Langston Rd | Skyway | All-way stop (no flasher) | Replace standard stop signs with three solar powered LED stop signs | Completed in November 2025 |
| Langston Road S & S 132nd Street | Skyway | Two-way stop | Remove overhead wires and flashers and replace with two solar powered LED stop signs and one LED yellow flashing advance warning sign. | Week of November 21, 2025 |
| 28th Avenue S & S 360th Street | East Federal Way | All-way stop | Remove overhead wires, flashers, and the standard stop signs and replace with four solar powered LED stop signs. | Completed in November 2025 |
| 276th Avenue SE & SE 216th Street | East of Hobart | Two-way stop | Remove overhead flashers for eastbound and the standard stop sign; replace with one solar powered LED stop sign and two LED yellow flashing advance warning signs. | Fall 2025 and winter 2026 |
| 148th Avenue SE & SE 224th Street | East of Kent | Two-way stop (no flasher) | Remove existing stop signs; install two solar powered LED stop signs and one LED yellow flashing advance warning sign. | Fall 2025 and winter 2026 |
| 164th Avenue SE & SE 224th Street | East of Kent | T-intersection; one way stop (no flasher) | Replace one existing stop sign with an LED solar powered sign and install two LED yellow flashing advance warning signs. | Week of November 20, 2025 |
| 164th Avenue SE & SE 240th Street | East of Kent | All-way stop | Remove existing stop signs and overhead flashing light; replace with four LED stop signs. | Week of December 9, 2025 |
| 196th Avenue SE & SE 232nd Street | West of Maple Valley | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs. | Completed in November 2025 |
| 212th Avenue SE & SE 400th Street | North of Enumclaw | Two-way stop | Remove overhead wires, flashers, and standard stop signs; replace with two solar powered LED stop signs and two LED yellow flashing advance warning signs. | Week of December 9, 2025 |
| 244th Avenue SE & SE 416th Street | North of Enumclaw | All-way stop | Remove overhead wires, flashers, and standard stop signs; replace with four solar powered LED stop signs. | Fall 2025 and winter 2026 |
| 284th Avenue SE & SE 416th Street | North of Enumclaw | Two-way stop (no flasher) | Remove standard stop signs and replace with two solar powered LED stop signs; install two LED yellow flashing advance warning signs. | Week of December 9, 2025 |
| 218th Way SE & SE Green Valley Road | SW of Black Diamond | All-way stop (no flasher) | Replace standard stop signs with four solar powered LED stop signs. | Week of December 9, 2025 |
| Vashon Hwy SW & SW 204th Street | Vashon | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs. We will also remove the pole and repair the nearby pavement. | Week of December 15, 2025 |
| Vashon Hwy SW & SW Bank Road | Vashon | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs. Replace three sidewalk panels. | Week of December 15, 2025 |
| Vashon Hwy SW & SW Burton Road | Vashon | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs. | Week of December 15, 2025 |
| Vashon Hwy SW & SW Cemetery Road | Vashon | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs and two LED yellow flashing advance warning signs. | Week of December 15, 2025 |
Frequently asked questions
Flashing stop signs are more noticeable than static signs, especially in low-light conditions or areas with high traffic volumes. The flashing lights can serve as a visual cue to drivers, prompting them to pay closer attention to the intersection and come to a complete stop.
Washington State law requires drivers to come to a complete stop at a stop sign, unless directed otherwise by a police officer, firefighter, or authorized flagger:
- At a clearly marked stop line
- Before entering a marked crosswalk on the near side of the intersection
- At the nearest point to the intersection where the driver can see approaching traffic
Project photos
All four stop signs at this All Way stop at SE 232nd Street and 196th Avenue SE near Maple Valley will be replaced with solar powered flashing LED stop signs. The existing wires and overhead flashing light will be removed. These improvements replace out-of-date technology with new infrastructure that increases safety for drivers, pedestrians, and cyclists. View larger image (1MB)
The three stop signs at the intersection of 59th Avenue S and South Langston Road will be replaced with solar powered flashing LED stop signs. View larger image (2MB)
This is an example of an advance warning sign with LED lights at the intersection of SE 224th Street and 148th Avenue SE near Lake Youngs. The lights alert drivers in both daylight and nighttime and improve safety. View larger image (1MB)