TRB’s National Cooperative Highway Research Program (NCHRP) Research Results Digest 307: Independent Review of the Mechanistic Empirical Pavement Design Guide (MEPDG) and Software explores the findings, conclusions, and recommendations of the independent review of new hot-mix asphalt pavement design, new Portland cement concrete pavement design, composite pavement design, and design reliability. The Digest also examines corrections and improvements to the MEPDG software, which represents the day-to-day implementation of the design guide itself.