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Publication Number: FHWA-HRT-12-068
Date: December 2012


Curl and Warp Analysis of The LTPP SPS-2 Site in Arizona


This report demonstrated the potential for isolating the effect of curl and warp from other sources of roughness in the study of long-term pavement performance due to the strong statistical relationship between changes in IRI and changes in PSG. This report also demonstrated that long-term increases in IRI may be caused solely by changes in curl and warp and do not necessarily indicate structural failure or increased surface distress. However, the statistical methods used in this study required a high volume of profile measurements. Refinement of the methods for more general applications with broader validity and less ambitious data requirements requires further study. The following investigations are recommended: