Accurate, consistent, and repeatable distress evaluation surveys can be performed by using the Distress Identification Manual for the Long-Term Pavement Performance Project. Color photograhphs and drawings illustrate the distresses found in three basic pavement types: asphalt concrete-surfaced; jointed (plain and reinforced) portland cement concrete; and continuously reinforced concrete. Drawings of the distress types provide a reference to assess their severity. Methods for measuring the size of distresses and for assigning severity levels are given. The manual also describes the cracks in the pavement. Sample forms for recording and reporting the data are included. The manual also tells how to calibrate and operate profile and fault measurement devices.
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