The report describes the results of a field evaluation to validate a new method for assessing pavement roughness developed in an earlier study and documented in NCHRP Report 275, 'Pavement Roughness and Rideability.' The pavement rideability number (RN) is predicted from the physical measurement of the pavement profile by means of a transform or relationship between the profile measurement and subjective ratings of the pavement rideability. Also included in the report are models to determine the need for pavement repair based on the RN computed from the pavement profile. An accurate, valid, and uniform measure of pavement surface ride characteristics is presented for consideration for adoption as an AASHTO standard. The findings will be of particular interest to highway personnel responsible for pavement management, rehabilitation, and reconstruction; for collection, analysis, and reporting data on pavement surface characteristics; and for testing and research activities.
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