Glossary and Acronyms

Surface Distress Index (SDI)

A measure that was developed by the New Jersey Department of Transportation to support pavement treatment selection and long-term analysis. Surface Distress Index uses observation of surface distresses to rate pavement conditions. It is a composite index that considers structural and nonstructural distress that can be observed at the pavement surface, including cracking, patching, shoulder deterioration, shoulder drop, faulting, joint deterioration, and running.


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