U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

Skip to content
Facebook iconYouTube iconTwitter iconFlickr iconLinkedInInstagram

Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

This report is an archived publication and may contain dated technical, contact, and link information
Back to Publication List        
Publication Number:  FHWA-RD-99-074    Date:  September 1999
Publication Number: FHWA-RD-99-074
Date: September 1999


Study of LTPP Distress Data Variability Volume I

This report is available only in PDF format.

PDF Version (6.32 MB)

PDF files can be viewed with the Acrobat® Reader®


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 and detection of variability sources. Distress data bias and precision were also quantified. In addition, a comparison of variability between 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 tvvo 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 Information 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.



Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101