Produced and maintained by the Transportation Research Board (TRB) at the National Academies of Sciences, "the Transportation Research Information Services (TRIS) Database is the world's largest and most comprehensive bibliographic resource on transportation information." Recently, an online version of TRIS was launched as a component of the National Transportation Library, providing access to...

Provided by the US Bureau of Transportation Statistics, this site for researchers and analysts, which is aimed at providing "one stop shopping" for transportation data, allows users to search over 100 databases, download data, complete online statistics, and view online maps pertaining to data. Data subjects related to physical science includes energy use statistics, a pollution database, air...