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AASHTO PP 37-04
- Standard Practice for Determination of International Roughness Index (IRI) to Quantify Roughness of Pavements
- standard by American Association of State and Highway Transportation Officials,
- 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.
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