This practice describes a method for estimating roughness for a pavement section. An international roughness index (IRI) statistic is calculated from a single longitudinal profile measured with a road profiler in both the inside and outside wheelpaths of the pavement. The average of these two IRI statistics is reported as the roughness of the pavement section.
AASHTO PP 37M-99 (2005)
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Standard Practice for Quantifying Roughness of Pavements
American Association of State Highway and Transportation Officials , 1999
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