AASHTO T 389-20 describes a procedure for measuring the influence of road surfaces on highway traffic noise. The Statistical Isolated Pass-By (SIP) Method provides a quantitative measure of the sound pressure level at locations adjacent to a roadway. The SIP method allows for the comparison of vehicle noise on roadways of varying surfaces and across studies by comparing measured sound levels to a reference noise curve.
AASHTO T 389-20 History
AASHTO T 389-22
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AASHTO T 389-20
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AASHTO TP 98-13 (2015)
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AASHTO TP 98-12
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