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ACKNOWLEDGMENTS Lisa Petraglia and Glen Weisbrod, Economic Development Re- search Group, Boston, Massachusetts, were 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 Robert Draper, Federal Highway Ad- ministration, HEPN-50, U.S. Department of Transportation; James H. Evans, National Park Service, U.S. Department of the Interior; Kimberly Fisher, Senior Program Officer, Transportation Research Board; Robert Gorman, Federal Highway Administration, HEPS-10, U.S. Department of Transportation; Carolyn Hyland-Ismart, District Director, Planning and Public Transportation, Florida Department of Transportation; Susan Perry, Consultant, Washington, D.C.; Katherine F. Turnbull, Associate Director, Texas Transportation Institute; and Dick Turner, Chief, Multimodal Planning Bureau, Montana Department of Transportation. This study was managed by Donna Vlasak, Senior Program Officer, 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 Stephen F. Maher, P.E., and Jon Williams, Managers, Synthesis Studies. 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.