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ACKNOWLEDGMENTS Andrew C. Lemer, Ph.D., Baltimore, Maryland, was responsible for collection of the data and preparation of the report. Valuable assistance in the preparation of this synthesis was provided by the Topic Panel, consisting of Andrew V. Bailey, II, Richmond, Virginia; Rick Drumm, Federal Highway Administration, Indianapolis; Andrew S. Griffith, Research Coordinator, Oregon Department of Trans- portation; Dennis E. Lebo, Manager, Center for Program Develop- ment, Pennsylvania Department of Transportation; Frank N. Lisle, Senior Program Officer, Transportation Research Board; Wayne MCDaniel, PB Consult, Inc., Washington, D.C.; Dave Schulz, Director, Infrastructure Technology Institute, Northwestern University; Jim Sorenson, Team Leader, Office of Asset Management, Federal Highway Administration; and Dean M. Testa, Chief, Construction and Mainte- nance, Kansas Department of Transportation. This study was managed by Jon Williams, Manager, 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 production. 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.
