Assembly Region

Assembly and Region

Assembly and Region define how reusable section intent is applied to station ranges.

Assembly

Assembly owns reusable section components.

Examples:

• lanes
• shoulders
• ditches
• side slopes
• benches
• pavement-related intent

Assembly can define ditch shapes and side-slope bench behavior. These are source definitions, not generated corridor geometry.

Region

Region owns station-range application control.

Region decides which base Assembly applies over a station range:

• one Assembly reference

Structure and Drainage do not get assigned from the Region panel. They choose their owning Region from their own panels.

Region Table

Regions are managed by Start STA.

• Start STA is selected from generated Stationing values.
• End STA is derived automatically from the next Region row's Start STA.
• The final Region row ends at the final Stationing value.
• Region ranges should be continuous. There should be no intentional gap between Regions.

Use Validate before Apply to confirm that selected Region stations exist in Stationing.

Presets

The Region panel includes practical preset data.

Drainage Control starts the drainage-control Region at STA 100.000 and closes the preset at the current final Stationing value.

After loading any preset, review the Assembly assignment before applying it to the project.

Rule

Region should reference the base Assembly only in the active v1 workflow.

It should not hide engineering meaning in free-form notes.

Drainage Position

Drainage follows Structures in the toolbar because Drainage Elements choose their owning Region and may reference Structure-backed nodes.