TRB’s Transportation Research Information Services (TRIS) online database includes information on, and when available links to, more than 15,000 papers and publications related to transportation security as part of its overall database of more than 650,000 records. TRIS is a bibliographic database funded by sponsors of TRB, primarily the state departments of transportation and selected federal transportation agencies. TRIS Online is hosted by the National Transportation Library under a cooperative agreement between the U.S. Bureau of Transportation Statistics and TRB.