So the last version was a bit complicated. This is pretty much self contained; you can open the blender file up, make some changes, press render and it will generate everything for you. Substitute your own source heightmaps instead of the template island or reroute some wires and sculpt something from scratch. This file uses nodes to render the roads you create with bezier curves out onto a heightmap and includes a preview scene so you can quickly see your changes with the press of a [few] buttons. Let me know if you have any issues using this and feel free to ask questions. Hopefully this can help some of you get into making terrains a bit easier. If you're even a little interested in making maps I recommend you give the file a try, it's pretty easy and extremely fast. From the moment you hit render you might have to wait less than a minute to drive the road directly in the game.