Variability in the roughness levels of jointed portland cement concrete (PCC) pavements can often be observed over short periods of time. This study
demonstrated specialized analyses for quantifying the effect of curl and warp on the roughness of jointed PCC pavements using profile data from the Long-Term Pavement Performance (LTPP) Specific Pavement Studies (SPS)-2 site in Arizona.

The study sought to quantify and explain changes in the International Roughness Index (IRI) observed over time on the LTPP SPS-2 site in Arizona using methods that were applied to other sites. (1) The study analyzed the profiles in detail by calculating their IRI values, examining the spatial distribution of roughness within them, viewing them with post-processing filters, and examining their spectral properties. The study also attempted to relate changes in IRI over time to design variables, maintenance history, and observations of distress