United States Department of Transportation
i
High Friction Surface Treatment Experimental Feature – Final Report and 3rd Year Monitoring Results
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2019-12-01
[PDF-21.38 MB]
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Edition:FINAL
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Abstract:This project monitored high friction surface treatment (HFST) at 30 locations throughout Central Alaska between 2016 and 2019. Monitoring indicates a loss of friction at all locations. There is a greater loss of friction associated with higher annual average daily traffic (AADT) per lane, high speeds and in curves. Overall, the friction loss in the wheel paths is more than anticipated for 4 years of installation. Published data on HFST installed in other parts of the country indicates 5-7 years of presence before significant friction loss. The DOT&PF was trusting a minimum of 3 years of presence when factoring for studded tire wear and plowing. It is recommended that HFST be removed in Anchorage and not used in the future in urban centers while studded tire use is allowed. If HFST is applied in the future it is recommended that method 1 be used, where machine mixing, measuring and automated, continuous application and thickness measurements are required.
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