Highways England manages levels of skid resistance on their network (the Strategic Road Network or SRN) 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 2016. This document provides a record of the procedure used to derive the LECFs that have been applied to the 2016 skid resistance survey data.

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