The junction toolbar will be disabled when there are no junctions in the project. See the junction properties page for more information about creating new junctions.
To access the tools for modifying junctions click the button.
You will see this toolbar appear on the top left of the plan view window:
Edit junction dimensions (Edit radius, add a lane or taper)
Edit junction
Modify junction vertical transition
Delete a junction
After clicking the Delete Junction button, click on a junction to remove it.
Deleting a junction will modify the Centreline Properties of the junctioning centreline, disallowing a junction to form at that end. If you need to later re-create a junction at the end of this road, you can re-enable the ability to junction from the Centreline Properties window.