United States Department of Transportation
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Abstract:Pavement distress is an important indicator of pavement performance. The Long-Term Pavement Performance (LTPP) program has been collecting distress information on more than 2,000 test sections located across North America since 1989. However, these surveys were performed using three different methodologies–two photographic and one manual. Additionally, over the years, distress definitions and measurement techniques were revised in an attempt to improve consistency in data collection. The primary objective of the research reported here was to produce a comprehensive consolidated distress data set to reconcile differences between data collected using these different methodologies.
After thorough review, two-thirds of the LTPP distress data were considered to be in "good shape" and could be included in the consolidated data set with no further effort. The other one-third of the data will require additional review by the agencies that performed the data collection. Overall, the discrepancies found between surveys were independent of distress methodology. The data sets from these different data collection methods could be combined without concern about a consistent bias existing in the data. Of the discrepancies that were observed, 17 percent could be attributed to human error, 6 percent to data collection methodology, 36 percent to the strategies used in this review, and 41 percent were unidentifiable.
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