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High Friction Surface (anti-skid) Treatment

Project completed in 2022

Witte Road SE .

Twisting roads like this one off Witte Road SE are good candidates for High Friction Surface Treatment. If a driver takes this corner too fast, they could lose control and crash into the wall under the bridge. The anti-skid treatment creates greater traction leading up to and inside the curve.

King County applied anti-skid treatment called High Friction Surface Treatment to 16 different roads in spring/summer 2022.

The anti-skid treatment improves safety by increasing traction and reducing the run-off-the-road crashes. This provides more rolling resistance and is most successful on sharp curves where drivers slide off the road and hit fences, other barriers, and end up in the grass or a ditch.

The map below shows the locations where we applied anti-skid treatment.

Vashon Highway SW.

Road Services uses anti-skid, high friction surface treatment on sharp curves, like those shown in this photo on Vashon Highway SW and 103rd Avenue SW. The anti-skid application adds more rolling resistance which helps prevent drivers from skidding off the road.

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24/7 Road Helpline

Call us for help at 206-477-8100 or 1-800-527-6237 with road maintenance and traffic safety issues in unincorporated King County — 24 hours a day

Project locations map

HFST project locations map.

Map showing high friction surface treatment locations in 2021 and 2022.

HFST project locations list

Letter on map Road Actual location Length in feet Date
E SW 204th Street 107th Avenue SW to 111th Avenue SW 300 Complete
F SW Bank Road Commons Road SW to Thorsen Road SW 300 Complete
J Fay Road NE State Route 203 to 302nd Way NE
300 Complete
N NE Union Hill Road 238th Avenue NE to 240th Way NE
400 Complete
L Batten Road NE NE 140th Street to 290th Avenue NE
600 Complete
C 169th Avenue SE Licorice Fern Trail to SE 112th Street 410 Complete
G SE Sweeney Road 212th Avenue SE to SE 222nd Street 700 Complete
A Witte Road SE SE 230th Place to SE 228th Street 400 Complete
H Witte Road SE SE 225th Place to State Route 169 325 Complete
P SE Covington-Sawyer Road 181st Avenue SE to 184th Place SE 450 Complete
M 212th Way SE SE 368th Street to SE 376th Street 350 Complete
I SE Green Valley Road House #17225 and House #17601 (near Doreen Johnson Conservation Area) 350 Complete
O SE 128th Street Between 166th Ave SE and Patriot Way 600 Complete
B SE Jones Road House #17601 and House #17711 350 Complete
D 352nd Avenue SE SE 254th Street to SE 252nd Street 600 Complete
K Black Diamond-Ravensdale Road SE/SE Ravensdale Way SE Ginder Lake Road to 267th Avenue SE 350 Complete