My first track and i'm making it with Race Track Builder. It's work in progress but it can be driven as a preview. I know i wouldn't have a problem trying someone's track in this state so i decided to share.
The main road is 17 km. in each direction and with side-roads 25km. The pits and the turning point at the end of the track are fictional. The rest of the track should be close to how it is in real life. It is a bit wider than IRL but not by much. I'd like to do much more on this track to make it look nicer, in fact as much as race track builder lets me. Only one connecting side-road is built so far but i didnt do any adjustments to it so i don't consider it usable yet. I think i'm done with the main road and apart from adding more textures and objects, i planned only minor adjustments to it. I really didnt put any effort to the part at the end where you turn around to go back. It is ugly as hell and will be changed but serves it's purpose for now. The track has 32 car slots and ai does ok in practice but for the race sessions they behave better when there's only 24 and not too much mixed classes. When the cars start to drive in opposite directions, there can be an accident or two... ai can get thrown into the abyss or far from the road into the terrain.
You were warned.