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Publication Number: FHWA-HRT-06-132
Date: December 2006

Long-Term Pavement Performance Program Manual for Falling Weight Deflectometer Measurements

December 2006
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This manual is intended for use in collection of Falling Weight Deflectometer (FWD) data for the Long-Term Pavement Performance (LTPP) program. As such, it contains background information on FWD equipment and the general role of FWD testing within LTPP as well as a set of field operations guidelines for the data collection process.

This is the fourth major version of the LTPP Manual for Falling Weight Deflectometer Measurements. The first two were developed under the auspices of the Strategic Highway Research Program; the last two were developed under contract to the Federal Highway Administration. The revisions to this manual reflect the changing data needs of LTPP as well as changes in FWD equipment.

The LTPP program is a continuing, active program. Current information and access to other technical references are available at the LTPP Web site Submit LTPP data requests, technical questions, and data user feedback to LTPP customer service by e-mail at ltppinfo@fhwa.dot.gov.

Gary L. Henderson
Director, Office of Infrastructure Research
and Development


This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. This report does not constitute a standard, specification, or regulation.

The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.


The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement.

Technical Report Documentation Page

1. Report No.


2. Government Accession No.

3. Recipient’s Catalog No.

4. Title and Subtitle

LTPP Manual for Falling Weight Deflectometer
Measurements, Version 4.1

5. Report Date

December 2006

6. Performing Organization Code


Peter N. Schmalzer

8. Performing Organization Report No.


9. Performing Organization Name and Address

MACTEC Engineering and Consulting, Inc.
12104 Indian Creek Court, Suite A
Beltsville, MD 20705-1242

10. Work Unit No. (TRAIS)

11. Contract or Grant No.


12. Sponsoring Agency Name and Address

Federal Highway Administration
Office of Infrastructure Research and Development
6300 Georgetown Pike
McLean, VA 22101-2296

13. Type of Report and Period Covered

Final Report, April 2005–July

14. Sponsoring Agency’s Code

15. Supplementary Notes

Contracting Officer’s Technical Representative (COTR): Aramis Lopez, Jr., HRDI-13.

16. Abstract

This document provides background information and field operations guidelines for the collection of Falling Weight Deflectometer (FWD) data on Long Term Pavement Performance (LTPP) test sections. It includes equipment setup, equipment calibration, test locations, and test procedures.

17. Key Words

Deflection measurement, falling weight deflectometer, LTPP

18. Distribution Statement

No restrictions. This document is available to the public through the National Technical
Information Service, Springfield, VA 22161.

19. Security Classif. (of this report)


20. Security Classif. (of this page)


21. No. of Pages


22. Price


Form DOT F 1700.7 (8-72)Reproduction of completed page authorized

Metric Conversion Chart




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