Corridors in version 0.7.9.1

[marcobost]

I find that "making the AIW" in BTB is an useful feature! I also think in the future it will be implemented to make easier than now, where possible.
At the moment I hope to post in the right plase to ask about the corridors that in very strong corners appear like the picture: I'm not sure how they works, so I extended the "green lines" to the track border (in this case the whole track is closed by walls) and I used the "red lines" just in few parts of track...

Is it correct corridors control lines are each over the others?

Thanks!