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ACKNOWLEDGMENTS Frederick Hugo, P.E., D.Eng., Ph.D., University of Stellenbosch, South Africa, and Amy Louise Epps Martin, P.E., Ph.D., Texas A&M University, were responsible for collection of the data and preparation of the report. André de Smit, a doctoral candidate from the Institute of Transport Technology of South Africa, assisted the consultants with the research and drafting of the synthesis. The assistance by the secretarial and library staff of the Institute of Transportation Technology is also acknowledged. Valuable assistance in the preparation of this synthesis was pro- vided by the Topic Panel, consisting of Bouzid Choubane, State Pavement Evaluation Engineer, Florida Department of Transporta- tion; Nicolaas F. Coetzee, Senior Engineer, Dynatest Consulting, Inc.; Glenn M. Engstrom, Manager, Minnesota Road Research Section, Minnesota Department of Transportation; Kenneth W. Fults, Director of Pavements, Texas Department of Transportation; Victor (Lee) Gal- livan, P.E., Pavement and Materials Engineer, Federal Highway Ad- ministrationâIndiana; Amir N. Hanna, Senior Program Officer, Transportation Research Board; Larry N. Lynch, Research Civil En- gineer, U.S. Army Corps of Engineers Research and Development Center; Stephen F. Maher, P.E., Senior Program Officer, Transporta- tion Research Board; John B. Metcalf, FreeportâMcMoRan Profes- sor, Civil and Environmental Engineering, Louisiana State Univer- sity; Terry M. Mitchell, Materials Research Engineer, Federal Highway Administration (HRDI-11); and James A. Sherwood, High- way Research Engineer, Federal Highway Administration (HRDI-12). This study was managed by Jon Williams, Synthesis Studies, who worked with the consultant, the Topic Panel, and the Project 20-5 Committee in the development and review of the report. Assistance in project scope development was provided by Donna Vlasak, Senior Program Officer. Don Tippman was responsible for editing and pro- duction. Cheryl Keith assisted in meeting logistics and distribution of the questionnaire and draft reports. Crawford F. Jencks, Manager, National Cooperative Highway Re- search Program, assisted the NCHRP 20-5 Committee and the Syn- thesis staff. Information on current practice was provided by many highway and transportation agencies. Their cooperation and assistance are appreciated.
