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Chapter 4. Inventory Data
4.1 Introduction to Inventory Data
The basic inventory data includes the data necessary to: (1) identify the test section, (2) describe the geometric details of its original construction and the material properties of its structural constituents at that time, and (3) identify construction costs of maintenance and repair performed before the long-term monitoring effort. All of these data should remain constant throughout the monitoring period. Data concerning the construction of any rehabilitation or maintenance treatment placed after the start of the LTPP program is stored in accordance with the guidelines outlined in the respective chapters of this document.
4.2 References Used in Collecting Inventory Data
Chapter 2 of the original DCG covers the collection of the inventory data from the State highway agency (SHA). The following list provides a reference for each version of the DCG in which changes were made to chapter 2 of the DCG. The month and year noted in each reference provides the timeframe during which each revision was relevant to the program and the point at which the previous version was no longer to be used.
- Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, SHRP, National Research Council, Washington, DC, January 1988.
- Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, SHRP, National Research Council, Washington, DC, January 1990.
- Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, FHWA, Pavement Performance Division, McLean, VA, October 28, 1993.
In 2005, chapter 2 of the DCG was separated into its own distinct document. Information was updated to incorporate all revisions made by directive since the previous issue of the revised chapter in 1993.
- Inventory Data Collection Guide for the Long-Term Pavement Performance Program, FHWA, Pavement Performance Division, McLean, VA, June 2005.
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