AASHTO TP 76-15

This test method describes the procedures for measuring tire/pavement noise using the on-board sound intensity (OBSI) method and the procedures for verification of the measurement system. The test method provides an objective measure of the acoustic power per unit area at points near the tire/pavement surface.The OBSI measurement method described herein permits tire/pavement noise to be measured in isolation of other noise sources allowing the noise performance of pavements to be compared.