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 form]

Anotations

Scope note:

Bridges linking two or more settled areas by means of a continuous or discontinuous row of buildings that accommodate different functions, such as domestic, cultural, social, or recreational uses, and are set upon or clustered along the transport route.