How can a designer set the elevation of crossing profiles so one of the crossing profiles adheres to the elevation of the other, and automatically adjusts to match? This can be accomplished by used the Intersection object. You will first need to have two alignments that cross. These alignments will also need profiles that accompany them. The main road or top priority alignment that will define the elevation of the intersection PVI can be either a surface profile or a design profile. The other alignment’s profile needs to be a design profile, so the addition of this intersection PVI can be added.

Using the Intersection Object

On the Home ribbon, select Create Intersection from the Intersection drop-down.

Command line prompt to select intersection point:

Select the intersection point in the drawing canvas.

At the command line, you are prompted to select the main road alignment. This is the top priority alignment. This alignment’s profile will define the elevation of the other.

The option to select the alignment from a list can be used by pressing Enter.

Once the main road alignment is selected, the Create Intersection dialog is shown.

Enter the name for the Intersection and then press Next to continue.

On the Geometry Details section, uncheck the option to “Create or specify offset alignments.”

Notice the Intersection Alignments priority graph. You may need to change either of the profiles if there is more than one profile that can be used.

Press the Create Intersection button. No other settings need to be changed.

An intersection object appears at the intersecting location of the two alignments.

The profile now shows a PVI at the crossing location. This PVI shows a lock symbol, as it is locked to the elevation of the top priority profile and cannot be edited.