Report: Roughness Index succeeding profilograph in pavement parameters

A new Louisiana Transportation Research Center (LTRC) report tracks a major transition in current U.S. concrete and asphalt pavement smoothness requirements. “Best Practices for Achieving and Measuring Pavement Smoothness, A Synthesis of State-of-Practice” shows a growing number of states moving away from profilograph-based specifications in favor of those determined on a more widely-accepted and precise measure: the International Roughness Index (IRI).