@Testgame
Tried a few other cars and none of them fell through at that spot. But in all of them, I can feel that there's something wrong with the road mesh, starting there and going on all along the length of the tunnel. After that it's really smooth again until the next turn.
If you know someone who can do something about that staircase thumb...thumb...thumb... feel in corners, it would help a lot.
No idea if it is that disturbing for all wheels, but on a DD wheel it's no fun.
I should add that I always use the BAC Mono for testing on all tracks and have no issues like this one here (that hole I mean).
EDIT: it just occured to me that I already had a High Speed Ring from ACF stashed in my storage and that it is totally different from this one.
So - since you overlooked/haven't answered my earlier question - I assume you are not ACF, right ?