TRR No. 1260 Pavement Design, Management And Performance, pp.99-105.
Relationships were developed to meet and facilitate roughness reporting and calibration requirements of the Highway Performance Monitoring System (HPMS) in Louisiana. Pavement roughness statistics obtained from a Face Dipstick, K. J. Law Model 8300 Roughness Surveyor, and Mays Ride Meter equipment were correlated to enable Louisiana to satisfy these requirements. On the basis of the results of this research and previously established relationships between the Mays Ride Meter and the ASSHO serviceability index (SI), comparisons of the international roughness index (IRI) and (SI) were then drawn for flexible and rigid pavements. A correlation was established between the IRI values obtained with the Face Dipstick and those obtained with the Model 8300 Roughness Surveyor for 5 flexible and 4 rigid pavement test sections. Correlations from field testing of the Model 8300 Roughness Surveyor and Mays Ride Meter on 20 flexible and 19 rigid test sections resulted in a distinct relational equation for each pavement type. However, results relating IRI and SI indicated that this relationship was the same for all pavement types. This methodology can be developed so that Louisiana can satisfy HPMS roughness testing and reporting requirements.