There are quite some games (strategic) that let users create maps.
The game had a language (WML) to program elements and a map editor.
I guess that a driving simulator would find opensource road/track generating useful.

There need to be a mountainous track.
There should be a linux-x64 .appimage version.

Nothing is perfect...

i agree with the mountain passes, that would make a huge difference

I would like to see Japanese mountain passes like, Akagi.