and here is a view of the (greatly) simplified node network.
In the Road Group, there are 7 parameters for the road, and 6 masks as a result. That's it.
The example shows, how the road and tarmac, the road line paint and the road repair bumps are embedded into your shader network.
Under the hood though, and that means in the internal networks of the groups and shaders, lies the real horse power engine that makes all this possible.
This is the most simplified network that comes with the pack. of course there will also be a tgd with all the nodes on the top level, and all the node connections visible (so no hidden nodes).
Frank