NHTSA Header Logo NHTSA Header Logo
New Search Browse Advanced Search Search History Marked Records TRT Help Return to NHTSA

Transportation Research Thesaurus

TRT Home | Hierarchical View | Alphabetical View | Download | About
The Transportation Research Thesaurus (TRT) is an important tool for vocabulary control. The National Transportation Library provides it here both as a tool for searching TRIS Online, the NTL Catalogs and other developing resources, and as a tool for indexers, catalogers and researchers in developing their own resources. TRT is maintained by the TRANSPORTATION RESEARCH BOARD. The NTL keeps this copy up to date using information from the TRB. The date of the latest update is 10/01/2008.

Top Terms

The thesaurus can be navigated in several ways:

  • If you know the hierarchical scheme, click on the Top Term on the left side of the screen.
  • To browse the entire hierarchy, click on the Hierarchical View link at the top of the screen.
  • If you know the first word of the term, click on the Alphabetical View link at the top of the screen.
  • If you are unsure of the correct term, enter the term in the search box at the top of the screen. See search tips below.

Search Tips:

  • Use * for multiple character truncation
    Ex: financ* finds finance, finances, financing, financed, and financial
  • Use # for single character truncation
    Ex: wom#n retrieves both woman and women
  • Supports Boolean searching: AND, OR, NOT
    Ex: control AND traffic NOT air
Web Policies & Notices  |   Terms of Use  |   FOIA  |   Privacy Policy  |   Cookie Policy  |   Accessibility  |   Email NHTSA
Plug-ins: PDF Reader | Flash Player | Excel Viewer | PowerPoint Viewer | Word Viewer | WinZip
Powered by NTL Integrated Search