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27 ACKNOWLEDGMENTS This study was performed under the overall guidance of the NCHRP Project Committee SP 20-06. The Committee is chaired by JAMES S. THIEL, Wisconsin Department of Transportation. Members are LAWRENCE A. DURANT, Louisiana Department of Transportation and Development; BRELEND C. GOWAN, California Department of Transportation (Retired); WILLIAM E. JAMES, Tennessee Attorney Generalâs Office; PAMELA S. LESLIE, Florida Department of Transportation; MICHAEL E. LIBONATI, Temple University School of Law; JULIA L. PERRY, Federal Highway Administration; MICHAEL E. TARDIF, Friemund, Jackson and Tardif, LLC; RICHARD L. TIEMEYER, Missouri Department of Transportation; THOMAS VIALL, Vermont Agency of Transportation; RICHARD L. WALTON, JR., Virginia Department of Transportation; and ROBERT L. WILSON, Arkansas State Highway and Transportation Department. EDWARD V. KUSSY provides liaison with the Federal Highway Administration, JO ANNE ROBINSON provides liaison with the Federal Highway Administration, and CRAWFORD F. JENCKS represents the NCHRP staff.