Definition
Standard Practice for Quantifying Cracks in Asphalt Pavement Surfaces. Defines crack severity classification by measured width (Low below 6mm, Medium 6-19mm, High above 19mm) and methods for computing crack density and extent. Road Triage applies R 55 width-based severity classification using proprietary image analysis within the Perception Engine to measure actual crack width in millimeters.
In context
Under AASHTO R 55, a 10 mm crack is classified as Medium severity, while a 25 mm crack is High.