This isn't a track-specific bug, but rather something related to layout editor, however i think this is the subforum it fits the best into
Stacking armco is a way to make somewhat realistic looking barriers, but collision doesn't seem to work properly when it's used, tyres can fuse through the horizontal armco bars and hit the posts with catastrophic results, causing heavy damage and catapulting cars into the air, see attached replays. This is not dissimilar to the infamous kerb-tyre bug.
I understand this is not quite an intended way of the objects being used, and i don't suppose it's something that will be readily fixed, but it would be great if it could be addressed. Additionally, maybe it would be worth adding the armco walls as a new layout object eliminating the need for doing things this way?