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
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Publication Number: FHWA-HRT-06-132
Date: December 2006
The FWD tow vehicle should be warmed to achieve an interior temperature of at least 5 °C (40 °F) before turning on the signal processor or data collection computer.
For testing in ambient temperatures at or below -10 °C (15 °F), the standard hydraulic fluid should be replaced with a lighter-weight synthetic fluid or other oils as recommended by the manufacturer. Some oils may not be appropriate for warm-weather operations.