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January 2018 NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM Sponsored by the American Association of State Highway and Transportation Officials and the Federal Highway Administration Senior Program Officer: Jo Allen Gause jagause@nas.edu C O N T E N T S Introduction, 1 The Synthesis Project, 2 Studies in Progress and Planned for 2018, 2 Selection of Topics, 2 Available Publications, 4 Index of Topic Subjects, 4 Conduct of the Studies, 4 Research Results Digest 402 INTRODUCTION Highway administrators, engineers, and researchers often face problems for which information already exists, either in docu- mented form or as undocumented experience and practice. This information may be frag- mented, scattered, and unevaluated. As a con- sequence, full knowledge of what has been learned about a problem may not be brought to bear on its solution. Costly research find- ings may go unused, valuable experience may be overlooked, and due consideration may not be given to recommended 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 This is a staff digest of the progress and status of NCHRP Project 20-05, âSynthesis of Information Related to Highway Problems,â for which the Trans- portation Research Board is the agency conducting the research. Individual studies for the project are managed by the following staff serving under the Cooperative Research Programs Division of the Transportation Research Board: Senior Program Officer: Jo Allen Gause Senior Program Officer: Mariela Garcia-Colberg Program Officer: Velvet Basemera-Fitzpatrick Consultant: Tanya M. Zwahlen Cooperative Research Programs Deputy Director & NCHRP Program Manager: Lori L. Sundstrom Cooperative Research Programs Director: Christopher J. Hedges You can submit your suggestion 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, usually in the late spring, to make the final selections. To be considered at the next annual cycle, all submissions should be received by February 16, 2018. If a topic is not selected, it may be resubmitted the following year to be considered. Interested in writing a synthesis? For details see the Synthesis homepage (address above) under âNew Topics.â