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. open automobiles

Anotations

Scope note:

Small, light, open automobiles powered by motorcycle engines and usually with four wheels, although some had three wheels; for three-wheeled closed automobiles, usually with larger engines, use "three-wheelers."