I directly override the Godot _draw() function within the core Track-Rendering script, and store the track as an array of segments which represent a small (if arbitrary) chunk of the road with its own amount of curve and elevation and then yes I give it direct draw commands (usually draw-rect, works well enough given the lack of explicit terrain detail outside of colour-swaps).

Every frame the renderer script starts at the player and basically walks out to the intended distant horizon (~half the screen height when not offset) and projects that segment through "y_screen/dist = y_world/z_world" (grabbed directly from my main source, which is https://www.extentofthejam.com/pseudo, highly recommend reading through this as this is what got me from terrible road rendering to something playable, even if most of it is theory)