DATA COLLECTION PROCEDURE FOR USE WITH SKID RESISTANCE MEASUREMENTS. VOLUME II: SUMMARY REPORT. FINAL REPORT

There are both short-term and seasonal changes in the skid resistance of highway pavements. A statistically based model was developed that can be used to correct measurements made on any arbitrary day to a reference value, the minimum skid number that would be measured at the end of the season. The model, which is based on previous research, includes short-term weather data, Julian Calendar Date and traffic data. Using the model and the data from the project, 90% of the predicted skid numbers were within + or - 3.5 skid numbers of the measured values. The model coefficients are State-specific and are different for bituminous and portland cement concrete surfaces. Data required to use the model can be readily obtained by a typical skid-testing crew or from available records. Volume I presents a detailed description of the data and procedures used to develop the model. Volume II contains a project summary, a procedure for implementing the model and guidelines for developing State-specific model coefficients.