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Publication Number: FHWA-RD-99-075
Date: September 1999
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This report, which is part of a two-volume set, documents the results of a study to evaluate and quantify the variability of pavement distress data collected in the Long-Term Pavement Performance (LTPP) program. Analyses were performed on both manual and film-derived distress data. General trends of the distress data were first investigated, followed by statistical analyses of repeatability ai1.d detection of variability sources. Distress data bias and precision were also quantified. In addition, a comparison of variability betvveen manual and film-derived distress data was conducted. This report will be of interest to engineers involved in pavement design, pavement performance evaluation and prediction, and pavement maintenance and rehabilitation.
Sufficient copies of this report are being distributed to provide two copies to each FHWA resource center and three copies to each FHWA division office and each State highway agency. Direct distribution is being made to the division offices. Additional copies for the public are available from the National Technical Infonnation Service (NTIS), 5285 Port Royal Road, Springfield, Virginia 22161.
T. Paul Teng, Director
Office of Structure, Research and Development
This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. This report does not constitute a standard, specification, or regulation.
The United States Government does not endorse products or manufacturers. Trade and manufacturers' names appear in this report only because they are considered essential to the object of the document.
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Pavement Distress, Pavement Evaluation, Manual Survey, Film-Derived Distress Data, Distress Data Variability, Bias and Precision, LTPP
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements, Pavements--Performance--Mathematical models, Pavement distress, Pavement performance, Bias (Statistics), Precision