High Friction Surface Treatment - Project Photos

Here you can see the HFST compared to the regular pavement. HFST is a site-specific application of very high quality, durable aggregates (think of them as tiny compacted particles). Crews use a polymer binder (like a glue) to put the HFST onto the existing pavement to restore and maintain friction.

In the summer of 2015, WSDOT added High Friction Surface Treatment (HFST) to two ramps in the Puget Sound area. This photo shows HFST on a highway in southwest Washington. The area above the white line is where the HFST was applied on top of the existing pavement.

HFST is now being used to reduce the number of wet weather related collisions on the eastbound State Route 526 on-ramp to southbound Interstate 5 in Everett, and on the 148th Avenue Southeast on-ramp to westbound Interstate 90 in Bellevue’s Eastgate neighborhood.