This report describes the validation of models previously developed to normalize pavement friction measurements to standard environmental and operational conditions. In addition, recommendations are reported to improve the techniques and equipment for pavement friction measurement. Two models were examined for normalization of weather-related and seasonal variation of pavement friction. Their performance was found to be comparable, but the generalized prediction model is more readily applied than the mechanistic model, which requires knowledge of the percent normalized gradient of the pavements to be adjusted. The suggested procedure for normalization requires that three pavements of each class in a homogeneous climate be tested once per month during the testing season. The data then can be used to develop the coefficients in the models to adjust single measurements of all other pavements to standard conditions.