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LED Stop Sign Upgrade Project
Work ongoing through 2024
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. New sites may be identified in the coming years to add additional LED signs throughout areas of unincorporated King County.
King County will replace standard stop signs and overhead flashing systems in 17 locations with LED flashing stop signs and advance warning systems. King County will continue the effort to improvement safety by adding LED stop signs and flashers at additional locations in late 2024 and beyond.
2024 LED stop sign upgrade locations
Crews need clear, dry weather to install LED stop signs. Scheduled work dates are weather sensitive and subject to change.
| Intersection | Neighborhood | 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 | Summer 2024 |
| 59th Avenue S & S Langston Rd | Skyway | All-way stop (no flasher) | Replace standard stop signs with three solar powered LED stop signs | Summer 2024 |
| 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. | Summer 2024 |
| 28th Avenue S & S 360th Street | East Federal Way | All-way stop | Remove overhead wires, flashers, and standard stop signs and replace with four solar powered LED stop signs. | Summer 2024 |
| 276th Avenue SE & SE 216th Street | East of Hobart | Two-way stop | Remove overhead flashers for eastbound and standard stop signs; replace with one solar powered LED stop sign and two LED yellow flashing advance warning signs. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
| 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. | Summer 2024 |
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)