United States Department of Transportation
i
Help With Converting Pavement Smoothness Specifications
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2002-11-01
[PDF-261.12 KB]
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Abstract:Pavement smoothness is a key factor in determining highway user satisfaction. To adequately represent drivers' opinions of roadway conditions, many highway agencies are transitioning to the International Roughness Index (IRI) or to the Profile Index (PI) using a 0.0-mm blanking band (PI sub 0.0) from the PI using a 5-mm or 2.5-mm blanking band (PI sub 5-mm or PI sub 2.5-mm). This has led to the need for correlation equations to relate the current PI sub 5-mm or PI sub 2.5-mm smoothness specification levels with those to be used in the new specifications. To address this issue, research was initiated to develop a practical tool to assist in the transition. Information developed in this research can be used by highway agencies to estimate the level of IRI and PI sub 0.0 smoothness associated with their current pavement smoothness specifications. Key findings of this research include the following: linear equations for converting from PI sub 5-mm and PI sub 2.5-mm to PI sub 0.0 and IRI indices; modified equations to account for effects of climate and pavement type, where statistically appropriate; quantified variability information for each correlation; and IRI and PI sub 0.0 specification levels converted from currently reported agency full-pay levels. This TechBrief provides information on data, analysis, results and applications of this research, as well as recommendations to agencies of ways they can make this research useful.
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