Uniform levels of service for winter operations are difficult to maintain across a large road network where snow conditions are monitored qualitatively and at infrequent intervals. The development of the variable slip approach to friction measurement provides an opportunity to measure or classify snow conditions automatically and with known reliability. Four approaches by which friction measurements can enhance existing Quality Assurance methods were investigated; aggregate friction over a road segment, point-wise classification of surface conditions, point-wise measurement of snow covered area and, frequency and length of snow covered patches. Automatic classification of surface types was reliable under limited conditions while measurement of snow cover fraction was highly reliable. Aggregate friction and snow covered patch length were closely related to each other and both were related to elapsed time since application of road salt. Sampling spacing requirements varied with the patchiness of snow cover, with maximum number of samples required at mid-range values of friction.