How to properly design terrain on a driving game?

So here I have these roads laid out on a driving map I’m making, and as you can see the roads are quite dynamic in positioning as they tilt both on the Y and X/Z axis. As one can probably deduce, the terrain around these roads would likely be quite hilly in real life, so I was wondering how one could achieve good part-based terrain in an environment such as this.

I’m going for an Ultimate Driving kind of vibe, as you probably might’ve guessed, and I know that the way their terrain is achieved is through basic triangles put together. I’ve looked at plugins that do this sort of thing, including DataBrain’s Terraingle and Atrazine’s Terrain, and they’re both certainly good and achieve a similar effect - but not exactly efficient for what I’m trying to do, especially when I’m trying to get the triangles to align with the “grass wedges” beside the roads.

I’d appreciate some insight into this, and tips on how I could achieve good part-based terrain on a driving game map.

Along with the plugins you’ve already described, I suggest using GapFill to clean it up so there’s no holes or weird looking spots.

Try using a heightmap.

Here’s a good tutorial:

Another good resource is this:
https://tangrams.github.io/heightmapper/

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Not roblox terrain, but made out of parts. Good idea nontheless, just not fit for this question.

Also for an answer to OP’s question (please forgive me if I’m wrong, haven’t played Ultimate Driving in ages), I think the terrain in that game was simple parts and wedges, with pre-made hills being added and edited slightly around the roads. That would get you a decent result quickly, and if you have a big map it’s not recommended to go for individually made mountains and hills every time, as it will take a lot of time to do.

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For part-based terrain, you should try making the deathrun-style terrain in blender.
Here is a video: https://www.youtube.com/watch?v=_PlYzgQyco8

why don’t you upload the terrain as mesh? do you have trouble with the size? also how did you tilt ur roads like that?