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AASHTO PP 37M-99 (2005)
- Standard Practice for Quantifying Roughness of Pavements
- standard by American Association of State and Highway Transportation Officials, 1999
- Publisher: AASHTO
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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.