Information exists on nearly every subject of concern to highway administrators 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 Transportation Officials--through the mechanism of the National Cooperative Highway Research Program (NCHRP)--authorized the Transportation Research Board to undertake a continuing study. This study, NCHRP Project 20-5, "Synthesis of Information Related to Highway Problems," searches out and synthesizes useful knowledge from all available sources and prepares concise, documented reports on specific topics. Reports from this endeavor constitute an NCHRP report series, "Synthesis of Highway Practice." This staff digest reports on the progress and status of NCHRP Project 20-5. Table 1 presents a list of the topics being studied. Table 2 contains synthesis topics selected for the FY 2007 program. NCHRP Project Committee SP20-5 members are listed in Table 3. Table 4 lists completed syntheses. Table 5 contains an index to the syntheses and studies. This NCHRP Research Results Digest may be accessed by Internet users at http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rrd_332.pdf
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