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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, they 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.

Status update

May 18, 2022

Some of the anti-skid, high friction traction treatment locations require pavement repairs in advance of the work. Below is a list of upcoming single lane closures for advance pavement repair work:

  • May 23 – May 26: SE Sweeney Road between 212th Ave SE and SE 222nd Street (Maple Valley)
  • May 23 – May 26: SE Covington-Sawyer Road from 181st Avenue SE to 184th Place SE (Maple Valley area)
  • May 25 – June 1: SE 128th Street from 186th Place SE to 193rd Lane SE (Renton area)
  • May 23 – May 25: 352nd Avenue SE from SE 254th Street to SE 252nd Street (near Kent-Kangley Rd)

Pavement repairs and anti-skid treatment requires dry weather conditions. Some of the scheduled work days may be delayed due to rain. Check the location schedule below for the latest information, or contact

King County Roads Services will apply an anti-skid treatment called “High Friction Surface Treatment” to 16 sections of King County Roads this spring and summer.

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 will apply anti-skid treatment.

Vashon Highway SW and 103rd Avenue 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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Broch Bender, Communications Manager
Desk 206-263-1189

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Project locations map

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

High Friction Surface Treatment locations

(Dates are weather dependent and may change without notice. Detours provided during full road closures, local and emergency vehicle access always allowed.)

Letter on map Road Actual location Length in feet Date
E SW 204th Street 107th Avenue SW to 111th Avenue SW 300 TBD
F SW Bank Road Commons Road SW to Thorsen Road SW 300 TBD

J Fay Road NE State Route 203 to 302nd Way NE
300 TBD

N NE Union Hill Road 238th Avenue NE to 240th Way NE
400 TBD

L Batten Road NE NE 140th Street to 290th Avenue NE
600 Full closure: From 7 a.m. on Monday, June 6 through 5:30 p.m. on Wednesday, June 8

Additional dates: TBD
C 169th Avenue SE Licorice Fern Trail to SE 112th Street 410 Single lane closure: 7 a.m. – 6 p.m. daily, Monday, May 31 through Tuesday, June 1

Additional dates: TBD
G SE Sweeney Road 212th Avenue SE to SE 222nd Street 700 TBD
A Witte Road SE SE 230th Place to SE 228th Street 400 TBD

H Witte Road SE SE 225th Place to State Route 169 325 TBD

P SE Covington-Sawyer Road 181st Avenue SE to 184th Place SE 450 Single lane closure: 7 a.m. – 6 p.m. daily, Monday, May 23 through Thursday, May 26

Additional dates: TBD
M 212th Way SE SE 368th Street to SE 376th Street 350 TBD

I SE Green Valley Road House #17225 & House #17601 (near Doreen Johnson Conservation Area) 350 TBD

O SE 128th Street 186th Place SE to 193rd Lane SE 600 Single lane closure: 7 a.m. – 6 p.m. daily, Wednesday, May 25 through Wednesday, June 1

Additional dates: TBD
B SE Jones Road House #17601 & House #17711 350 Full closure: From 7 a.m. on Tuesday, May 31 through 5:30 p.m. on Thursday, June 2

Additional dates: TBD
D 352nd Avenue SE SE 254th Street to SE 252nd Street 600 COMPLETED: Single lane closure: 7 a.m. – 6 p.m. daily, Monday, May 23 through Wednesday, May 25

Additional dates: TBD
K Black Diamond-Ravensdale Road SE/SE Ravensdale Way SE Ginder Lake Road to 267th Avenue SE 350 TBD
TOTAL 6,785
Contact us

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

TTY Relay: 711

Twitter: @KCRoads