United States Department of Transportation (USDOT) TRIS Online small green bullet TRT small green bullet NTL Catalogs
NTL Integrated Search
National Transportation Library
 Transportation Research Board
Transportation Research Board
Of the National Academies
New Search Browse Advanced Search Search History Marked Records TRT Help

Transportation Research Thesaurus

 TRT Home | Hierarchical View | Alphabetical View | Download | About
Each term in the TRT is assigned a unique notational code that conveys its location within the hierarchy. The first letter of the notation represents the facet or top term. Using the notational code it is easy to determine the terms relation in the hierarchy. The term's parent (Ae) will have one less letter (from the right end) as the term (Aea). Siblings (Aeg, Aes) will have the same notational code as the term except the last letter will be different. Children (Aeac, Aeah) will have one letter appended to the end of the notational code of the term.

Hierarchical Display

Top Terms> Safety and security > Hazards and emergency operations > Disasters and emergency operations > Lifelines

Hhg: Disasters and emergency operations
Hhgm: Lifelines

Find documents having Lifelines

Scope Note:
"A route or means of transportation or communications for food, medicine or assistance"
 
Broader Term:
Hhg: Disasters and emergency operations
 
Related Terms:
Hhgd: Disasters
Hhge: Emergencies
Hhgr: Search and rescue operations
Hhgv: Evacuation
TRIS is a bibliographic database funded by sponsors of the Transportation Research Board (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 Bureau of Transportation Statistics and TRB.
Privacy Policy | Accessibility
Plug-ins: PDF Reader | Flash Player | Excel Viewer | PowerPoint Viewer | Word Viewer | WinZip