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Publication Number: FHWA-RD-06-067
Date: March 2006

Guidelines for The Collection of Long-Term Pavement Performance Data

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.

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.


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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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