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Transportation Research Thesaurus

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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> Vehicles and equipment > Vehicles > Ground vehicles > Motor vehicles

Qbd: Ground vehicles
Qbdd: Motor vehicles
 Qbddb: Vehicle fleets
Click to expand Qbddf: Trucks
Click to expand Qbddh: Passenger vehicles
Click to expand Qbddk: Special purpose vehicles
Click to expand Qbddp: Vehicles by motive power
Click to expand Qbddv: Vehicles by speed
Click to expand Qbddw: Vehicles by weight

Use For:
Automotive vehicles
 
Broader Term:
Qbd: Ground vehicles
 
Related Terms:
Qbdb: Rolling stock
Qbdf: Horse drawn vehicles
Qbdh: Human powered vehicles
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