Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Single Built Works (hierarchy name)
5. single built works (built environment)
6. [single built works by specific type]
7. [single built works by function]
8. transportation structures
9. [transportation structures by form]
10. bridges (built works)
11. [bridges by construction]

Anotations

Scope note:

Bridges in which the roadway is suspended from cables, ropes, or chains attached to natural or constructed supports. The term applies both to primitive and massively engineered structures that share this basic principle.