Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Transportation Vehicles (hierarchy name)
5. vehicles (transportation)
6. land vehicles
7. [land vehicles by form]
8. freewheeled vehicles
9. [freewheeled vehicles by form or function]
10. passenger vehicles
11. automobiles
12. [automobiles by form]
13. closed automobiles

Anotations

Scope note:

Three-wheeled automobiles with closed bodies; for smaller, open automobiles with three or four wheels and powered by smaller engines, use "cyclecars"; for three-wheeled open vehicles of simple, light, open framework construction usually powered by the rider, but sometimes motorized, use "tricycles."