Road Roughness 1
Road Roughness 1 : (1) A condition parameter used to characterise deviations from the intended longitudinal profile of a road surface, with characteristic dimensions that affect vehicle dynamics (and hence road user costs), ride quality and dynamic pavement loading. (2) A measure of surface irregularities with wavelengths between 0.5 and 50 m in the longitudinal profile of one or two wheel tracks in a traffic lane, reported in dimensionless units as either International Roughness Index (IRI, m/km) or as NAASRA Roughness Meter counts (NRM, counts/km) for the lane
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