Study of LTPP Distress Data Variability, Volume I
Primary Topic: Pavement Evaluation
Description: Reliable distress data for pavement performance model development and validation, and other pavement engineering products, are critical to the success of the Long-Term Pavement Performance (LTPP) program. Confidence in distress data requires a measure of error because of the bias and precision components of its variability. No systematic evaluation has been performed to quantify the bias and variability associated with both the manual and PASCO film-based distress data. In view of this, this study was undertaken by the Federal Highway Administration (FHWA) to assess the variability of the LTPP distress data, including those in the Information Management System (IMS) and those currently being collected using either photographic or manual methods.
This main volume of the report contains sources of data used in the analyses, evaluation of manual distress data, evaluation of film-derived distress data, comparisons of data obtained from these two methods, and conclusions and recommendations.
Volume II: Appendices A to C is FHWA-RD-99-075.
FHWA Publication Number: FHWA-RD-99-074
Publication Year: 1999