U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
Publication Number: FHWA-HRT-06-132
Date: December 2006
Because of the extensive use of FWDs in LTPP, routine equipment checks are extremely important. The FWD operator should perform the checks in this section each day that the FWD is traveling or in operation. These checks are a minimum. Operators are expected to keep an eye out for other anomalous conditions while performing these checks. These checks are not to supersede the manufacturer’s minimum requirements for warranty compliance.
An operator must address any deficiencies noted while performing these checks before any further transit or testing.
The operator should perform the following checks on the tow vehicle before the start of travel for the day:
The operator should perform the following checks on the FWD trailer before the start of travel for the day:
At a minimum, the FWD operator should perform the following checks after the FWD arrives at the test site and before testing begins:
In addition, the operator should observe and listen to the hydraulics during the buffer warm-up sequence to ensure that they are free of air and operating correctly.
At a minimum, the FWD operator should perform the following checks before leaving the test site:
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Deflection measurement, falling weight deflectometer, LTPP
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements