City Skylines Road Creation

Hey guys,

I can find about 1.000.000 tutorials about how to set up a third person shooter, but I can´t find anything about how to create a City Skylines Game in depth.

To break this into smaller pieces, my first question is, how you would create a City Skylines road creating system? They use a kind of node-base system, right?

Really looking forward to your answers,

I believe you would start by looking at splines, I have seen a couple of examples of this being used and for roads in particular