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ASTM D6433 is based on a 0 to 100 rating scale where 0 represents a failed roadway condition and 100 represent an excellent roadway condition.Typical PCI score and associated conditions are as follows:86-100 = Good71-85 = Satisfactory56-70 = Fair41-55 = Poor26-40 = Very Poor11-25 = Serious0-10 = FailedThe International Roughness Index (IRI) is the roughness index most commonly obtained from measured longitudinal road profiles. It is calculated using a surface profiling system with units of slope (inches/mile)Typica IRI ranges are as follows:625 = Very PoorRutting is a surface depression in the wheel path. Rutting steams from a pavement deformation in any of the pavement layers or subgrades. This is usually caused by consolidated or lateral movement of the materials due to traffic load. 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