United States Department of Transportation
i
Lateral Variation in Pavement Smoothness
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2002-12-01
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[PDF-1.49 MB]
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TRIS Online Accession Number:00938446
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OCLC Number:52218840
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Edition:Final report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-PLANNING AND POLICY-PLANNING AND POLICY;NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Flow;
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Abstract:Current performance-based contracting specifications employ International Roughness Index (IRI) to measure the smoothness of a pavement as perceived by the motorist. This parameter is measured in the outer or right-hand traffic lane and requires an understanding of how smoothness, as measured by IRI, varies spatially, with time and other design factors. Recently the change in traffic flow characteristics where heavy volumes of traffic travel in the left-hand lane or lanes of multi-lane highways has raised issues as to whether or not measurements in the outer lane represent a "worst case" condition for the assessment of pavement performance and design considerations. To assess these variables a large field data set of IRI data across all lanes of four multi-lane highways was collected during field photolog operations by Connecticut Department of Transportation staff. These data were analyzed to determine if there were statistical differences laterally on the test routes. It was concluded that there are smoothness differences in adjacent lanes of multi-lane freeways, which are consistent, random and small in value (0.2 m/km). No strong causal relationships were found in the variables studied, age, pavement design and type, or traffic load. Rutting was found to have more influence on IRI than cracking. Large values recorded, outliers, are associated with construction and maintenance activities. /Abstract from report summary page/
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