Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Open Spaces and Site Elements (hierarchy name )
5. open spaces
6. [open spaces by function]
7. transportation spaces
8. roads
9. [roads by form]
10. highways

Anotations

Scope note:

Highways with a broad median strip extending down the center, designed to prevent collisions and headlight glare from oncoming traffic. Highways with a broad median strip extending down the center, designed to prevent collisions and headlight glare from oncoming traffic.