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ACKNOWLEDGMENTS This study was performed under the overall guidance of the NCHRP Project Committee SP 20-6. The Committee is chaired by MICHAEL E. TARDIF, Friemund, Jackson and Tardif, LLC. Members are RICHARD A. CHRISTOPHER, HDR Engineering; TONI H. CLITHERO, Vermont Agency of Transportation; JOANN GEORGALLIS, California Department of Transportation; JAMES H. ISONHOOD, Mississippi Office of the Attorney General; THOMAS G. REEVES, Consultant, Maine; MARCELLE SATTIEWHITE JONES, Jacob, Carter and Burgess, Inc.; ROBERT J. SHEA, Pennsylvania Department of Transportation; JAY L. SMITH, Missouri Department of Transportation; and JOHN W. STRAHAN, Consultant, Kansas. MEGHAN P. JONES provided liaison with the Federal Highway Administration, and GWEN CHISHOLM SMITH represents the NCHRP staff.
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These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP). Persons wanting to pursue the project subject matter in greater depth should contact the CRP Staff, Transportation Research Board of the National Academies of Sciences, Engineering, and Medicine, 500 Fifth Street, NW, Washington, DC 20001. Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 Subscriber Categories: Construction ⢠Highways ⢠Law LRD 74_COVER_final.indd 4 1/13/17 6:10 PM NON-PROFIT ORG. U.S. POSTAGE PAID COLUMBIA, MD PERMIT NO. 88
