Contact Person
Dr. Robert Raab
LTPP Program Manager
rraab@nas.edu
202-334-3000
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Long-Term Pavement Performance Studies
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The Long-Term Pavement Performance program (LTPP) is the largest pavement performance research program ever undertaken, gathering data from 2,000 pavement test sections over a 20-year test period. The Federal Highway Administration (FHWA) has operational responsibility for the studies and maintains a resource web site for current and historical information.
With more than a decade of data collection and analysis now available, valuable insights, innovations, and products will emerge from the LTPP studies in the next several years. What has been accomplished so far and what is needed to realize the promise of the 20-year LTPP effort are identified in Fulfilling the Promise of Better Roads: A Report of the TRB Long-Term Pavement Performance Committee.
The LTPP data are being collected in a database known as the LTPP National Information Management System. The database includes information on environment, traffic, inventory, monitoring, maintenance, materials, and rehabilitation for each test section. Potential users of the database should first refer to the User Reference Guide, which provides an introduction to the structure of the LTPP program, the relational structure of the LTPP database, a description of the location of various data elements, contents of the data tables, tips on efficient means of manipulating data for specific types of investigations, and examples of Structured Query Language (SQL) scripts that can be used to build user-defined custom extractions.
The TRB LTPP Committee monitors the status and progress of the LTPP studies and provides technical advice and assistance to the FHWA concerning courses of action and the future direction of the studies. The advice and recommendations of the committee are transmitted to the FHWA and to the American Association of State Highway and Transportation Officials (AASHTO) in letter reports.
The Data Analysis Working Group (DAWG) is a forum for discussion of methods of analysis of pavement performance data. Presentations at DAWG meetings emphasize techniques for extracting and analyzing data, and the model building, sensitivity analysis, and development of transfer functions linking structural response to distress.
Contact Dr. Robert Raab, LTPP Program Manager, rraab@nas.edu
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