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King County Roads Services will apply a High Friction Surface Treatment (HFST) to 16 sections of King County Roads during the Summer 2021 and Summer 2022. Summer 2021 work will begin in August.

The anti-skid treatment improves safety by increasing traction and reducing the run-off-the-road crashes. The product 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.

King County applied this innovative product in 2015 and 2018 with success. King County has analyzed and reviewed areas where it could continue to make a difference.

The map below shows the locations where we will apply the treatment in 2021 and 2022.

High friction surface treatment project locations map.
Map showing high friction surface treatment locations in 2021 and 2022. Larger view PDF 538KB

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Broch Bender, Communications Manager
Desk 206-263-1189

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Example of a road with a sharp corner that is a good candidate for high friction surface treatment.

Roads like these are good candidates for High Friction Surface Treatment. If a driver takes this corner too fast, s/he may slide and hit the trees or bounce off the guardrail. In this case, the anti-skid treatment creates greater traction leading up to and inside the curve, and the guardrail installation reduces the chance of hitting the trees which could cause greater physical harm.

HFST locations in 2021 and 2022

# Road Actual location
1 Batten Road NE NE 140th Street to 290th Avenue NE
2 Fay Road NW State Route 203 to 302nd Way NE
3 NE Union Hill Road 238th Avenue NE to 240th Way NE
4 SE Jones Road House #17601 & House #17711
5 169th Avenue SE Licorice Fern Trail to SE 112th Street
6 SE 128th Street 186th Place SE to 193rd Lane SE
7 Witte Road SE SE 225th Place to State Route 169
8 Sweeney Road SE 212th Avenue SE to SE 222nd Street
9 Witte Road SE SE 230th Place to SE 228th Street
10 352nd Avenue SE SE 254th Street to SE 252nd Street
11 Black Diamond Ravensdale Road Lake Ginder Road to 267th Avenue SE
12 SE Covington Sawyer Road 181st Avenue SE to 184th Place SE
13 212th Way SE SE 368th Street to SE 376th Street
14 SE Green Valley Road House #17225 & House #17601 (near Doreen Johnson Conservation Area)
15 SW 204th Street 107th Avenue SW to 111th Avenue SW
16 SW Bank Road Commons Road SW to Thorsen Road SW

Contact us

24/7 Road Helpline: 206-477-8100 or 1-800-527-6237

TTY Relay: 711

Twitter: @KCRoads