• Calculation of Local Equilibrium Correction Factors

As part of the process for managing skid resistance on its network (the Strategic Road Network or SRN), Highways England carries out single annual skid resistance surveys (SASS). The measurements from 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 2017. This document provides a record of the procedure used to derive the LECFs that have been applied to the 2017 skid resistance survey data.

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