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52 AASHTO American Association of State Highway and Transportation Officials AC Asphalt Concrete BMS Bridge Management System DMI Distance Measuring Instrument DOT Department of Transportation HPMS Highway Performance Monitoring System HRI Half-Car Roughness Index IRI International Roughness Index MIRI Mean IRI NBI National Bridge Inventory NBIS National Bridge Inspection Standards NHS National Highway System PI Profile Index PMS Pavement Management System Abbreviations and Acronyms