Precision and Bias Statements for AASHTO Standard Methods of Test TP 98 and TP 99

TRB’s National Cooperative Highway Research Program (NCHRP) Web-Only Document 217: Precision and Bias Statements for AASHTO Standard Methods of Test TP 98 and TP 99 documents and presents results of a study of precision and bias associated with two AASHTO standards used to measure tire-pavement noise. The research team digitally recorded audio and video of traffic on segments of highways that were flat, had certain mixes of cars and heavy trucks, and met other criteria. Test operators on the research team were able to perform measurements in accordance with TP 98 and TP 99 in a controlled environment remote from the roadways in order to accomplish a Repeatability and Reproducibility study. Statistical analyses were performed on the test operator results.