Use the Create Roundabout command to create a roundabout in your roadway model.
You can create a roundabout from alignments that intersect, or from alignments that do not intersect. If your alignments intersect, you may need to add approach roads after the alignment has been created. If you start with alignments that do not intersect, the approach roads are added automatically.
Typically, you will have two or more alignments drawn, representing approach roads. However, you may begin with just one alignment, if you desire just one approach road connected to the roundabout.
Creating Roundabouts from Intersecting Alignments
If you create a roundabout from intersecting alignments, you may need to add additional approach roads after you create the roundabout. For example, the following illustration shows two alignments that intersect.
In this example, the two alignments intersect each other, and they both pass through the roundabout location on both sides.
If you run the Create Roundabout command in this situation, and select these two alignments, the following roundabout is created:
This roundabout contains only two approach roads. If you want more approach roads in this roundabout, you can add them using the Add Approach command.
Creating Roundabouts from Non-Intersecting Alignments
If you create a roundabout from alignments that do not intersect, you can create all four approach roads at once. In this scenario, the approach roads are added automatically, according to the alignments that have been selected. For example, the following illustration shows four alignments that do not intersect.
If you run the Create Roundabout command and select these four alignments, the following roundabout is created:
In this scenario, four approach roads are created automatically.
