TRID (Transportation Research Information Database) This link opens in a new windowIncludes the Transportation Research Board's Transportation Research Information Services (TRIS) Database and the OECD's Joint Transport Research Centre's International Transport Research Documentation (ITRD) Database. Released in 2011, it is produced and maintained by the TRB at the National Academies of Sciences with sponsorship by the state departments of transportation, the various administrations at the U.S. Department of Transportation, other sponsors of TRB's core technical activities and the ITRD member organizations. Covers all modes and disciplines of transportation and contains more than 900,000 references to books, technical reports, conference proceedings, and journal articles. More than 64,000 records contain links to full-text documents. Coverage is from 1968, with some bits from prior years.