Evaluating LineTerra with the same name again reopens that road's toolbar; evaluating it with a different name opens another road, and the first road's state is saved automatically.
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If a terrain is already loaded, a newly opened road inherits it, so several roads can be designed on one piece of ground without reloading terrain.
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The toolbar's buttons are Close Views, + New Project, + Add Road, Terrain, Plan/Profile, Intersect, Templates, Sections, Earthwork, Export, 3D View, Bake Road, Coords and Help.
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The interface is built from Dynamic content, dialogs, palettes and CreateDocument windows, so it needs the notebook front end and will not run under a bare kernel or wolframscript.
Examples
(1)
Basic Examples
(1)
Open the toolbar for a project called Road A:
In[1]:=
LineTerra
["RoadA"]
Open a second road on the same terrain. Road A's state is saved automatically, and Road A is drawn as a grey overlay on Road B's plan: