How to create roads, pathways, and water courses in Sketchup using a center line with Instant Road. This SketchUp plugin and more at www.valiarchitects.com/sketchup_scripts/ Instant Road plugin automates creation of roads, pathways, and waterways on a terrain using either an outline or a centerline for input. Creates center medians and islands, curbs, sidewalks, depressed road surfaces, or raised road surfaces.