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January 2017 NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Sponsored by the American Association of State Highway and Transportation Officials and the Federal Highway Administration Senior Program Officer: Christopher J. Hedges chedges@nas.edu C o n t e n t s Introduction, 1 the synthesis Project, 2 Studies in Progress and Planned for 2017, 2 Selection of Topics, 3 Available Publications, 4 Index of Topic Subjects, 4 Conduct of the Studies, 4 Research Results Digest 401 IntRoDUCtIon Highway administrators, engineers, and researchers often face problems for which information already exists, either in docu- mented form or as undocumented experi- ence and practice. This information may be fragmented, scattered, and unevaluated. As a consequence, full knowledge of what has been learned about a problem may not be brought to bear on its solution. Costly research findings may go unused, valuable experience may be overlooked, and due consideration may not be given to recom- mended practices for solving or alle viating the problem. There is information on nearly every subject of concern to highway administra- tors and engineers. Much of it derives from research or from the work of practitioners faced with problems in their day-to-day work. To provide a systematic means for assembling and evaluating such useful information and making it available to the entire highway community, the American Association of State Highway and Trans- portation Officialsâthrough the mecha- nism of the National Cooperative Highway ContInUInG PRoJeCt to sYntHesIZe InFoRMAtIon on HIGHWAY PRoBLeMs A staff digest of the progress and status of NCHRP Project 20-05, âSynthesis of Information Related to Highway Problems,â for which the Transportation Research Board is the agency conducting the research. Individual studies for the project are managed by Jon M. Williams, Program Director, Synthesis Studies; Gail R. Staba, Senior Program Officer; Jo Allen Gause, Senior Program Officer; Mariela Garcia-Colberg, Senior Program Officer, and Tanya M. Zwahlen, Consultant, serving under the Studies and Special Programs Division of the Board, Stephen R. Godwin, Director. You can submit your recommendation at: http://www.trb.org/Synthesis Programs/Suggest.aspx âSynthesis Topic Submittals.â Topics suggested must be accompanied by a brief (one or two paragraphs) scope statement, including a discussion of the problem. A title (preferably 10 words or less) and the name and affiliation of the submit- ter are also necessary. Identification of information sources is appreciated. A committee meets once each year, usu- ally in the late spring, to make the final selections. To be considered at the next annual cycle, all submissions should be received by February 2017. If a topic is not selected, it may be resubmitted the following year to be considered. Interested in writing a synthesis? For details contact see the Synthe- sis homepage (address above) under âNew Topics.â