How to create big tracks from Google Maps data?

[Dark Session]

Well i want to create a 20 km Long and 10 km wide track. The problem is, as soon as i load in the Google Maps data everything is insanely blurry. And because of the low poly count there is absolutely no Elevation data, everything is flat. It works good when im making smaller tracks.

I only need the high res images for placing my tracks and for the elevation data, im gonna replace the ground texture myself. So is there any way to get a high resolution image of a huge track into RTB for reference?

[Pyrx]

You need to subdivide the triangles in order to get more elevation detail. it's showed in brendon's tutorial videos on youtube, e.g. https://youtu.be/bPFz1UDl4Sw?list=PL9LDuIx0UB-dJnApA6pucDRBtMG6qLNxv&t=190
I recommend to watch dem all.

Referring to blurryness: RTB always makes terrain texture in 4096x4096 px. The bigger the area you choose, the less details you will see in the texture. But RTB can handle Textures up to 16384x16384 px. However, producing such a high-resolution texture is not that easy. There are threads here that deal with this topic. You have to use other mapping tools, like SASPlanet or MapPuzzle and you have to scale your big map manual to the one RTB generated in an image processing programm like Photoshop.