Introduction to LTPP data
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Introduction to LTPP data

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    NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
  • Abstract:
    The Long Term Pavement Performance (LTPP) program was established to support a broad range of pavement performance analyses leading to improved engineering tools to design, construct, and manage pavements. Since 1989, LTPP has collected data on the performance of pavement test sections located on in-service roadways across North America. Most of the data and information collected on the approximately 2,500 test sections are stored in the LTPP database, called the Information Management System (IMS). Currently, the LTPP IMS consists of 16 general data modules with 430 tables containing more than 8,000 unique data elements. In the eleventh year of the LTPP program, the IMS continues to evolve. In 1998, the migration of the database to a Windows NT distributed environment was completed. This required programming and other structural changes to the database. Currently, new tables are being added to store computed parameters resulting from various preliminary analyses performed on the data. These computed parameters represent engineering calculations from raw data to enable higher order types of pavement performance analysis to be performed more efficiently. Layer elastic modulus from backcalculation of deflection measurements is an example of a computed parameter. This document presents a discussion of the uses of and limitations of LTPP data in pavement performance analyses, general data availability, and data update schedule. Specific details on the structure of the IMS and how to obtain data can be found in the LTPP Data User's Reference Manual (
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