Intersection objects persist in an AutoCAD drawing as objects with the type AeccIntersection.
The intersection object allows you to create a 2D or 3D dynamic model of a T-shaped (3-way) intersection, or a four-way intersection.
Before creating an intersection object, you must have two alignments that intersect. If you want to create a three-dimensional intersection model, you must also have profiles associated with the intersecting alignments. Once you have the desired prerequisites, then you can create the intersection object using the Create Intersection wizard.
When the intersection object is created, a variety of tasks can be performed automatically, including the following:
- creates offset alignments for the roads included in the intersection
- creates curb return alignments (curb returns) in the intersection area
- creates profiles for the offset alignments and curb return alignments created when the intersection was created (Note: An exception to this is that if you set pre-defined static alignments as offsets, it is expected that you will specify profiles too. No dynamic offset profiles will be created.)
- creates new corridor regions for the existing corridors in the intersection area, or creates new corridor objects in the intersection area
- locks the profile elevations of the secondary road to the main (primary) road profile
Some of these tasks are optional. They depend on options selected on the wizard dialog boxes.
For overview information about AutoCAD Civil 3D objects, see Understanding Civil 3D Objects.