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ACKNOWLEDGMENT
This work was sponsored by the American
Association of State Highway and Transportation
Officials (AASHTO), in cooperation with the Federal
Highway Administration, and was conducted in the
National Cooperative Highway Research Program
(NCHRP), which is administered by the Transportation
Research Board (TRB) of the National Research
Council.
DISCLAIMER
The opinion and conclusions expressed or implied in
the report are those of the research agency. They are
not necessarily those of the TRB, the National
Research Council, AASHTO, or the U.S. Government.
This report has not been edited by TRB.
