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Highways England manages levels of skid resistance on their network by carrying out single annual skid resistance surveys (SASS). These surveys are corrected for seasonal variation by the application of correction factors called the “Local Equilibrium Correction Factors” (LECF). The procedure used since 2007 to calculate the LECFs was used again during 2015. This document provides a record of the procedure used to derive the LECFs that have been applied to the 2015 skid resistance survey data.

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