- Dictionary : PIARC Road Dictionary/ English
- Theme : Operations / Road Surface Characteristics
- Definition : Surface irregularities of a road pavement with horizontal dimensions greater than 500 mm and vertical dimensions exceeding the tolerance of the design specifications.
Note: unevenness is usually identified in two forms: longitudinal or transverse. The former is associated with riding comfort and the latter with rutting [ISO].
- Synonyms : roughness (US)
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