Mesh Road Editor
From BeamNG
Unlike the Decal Road editor, this creates a flexible 3D road model that makes for a very smooth and easily editable road. However this has some drawbacks. These are not commonly used and are not popular with the BeamNG community, and they often have lighting and texture issues. It is only advisable to use this tool for making guardrails, fences that follow the general curve of the road, and bridges (however for bridges, you can get more precise results by using Blender or SketchUp).