Non existent anymore. If you look up the reference for Avoiding Controlled Airspace in the AIP (ENR 1.1-45 para 4.1.12) you will find that it simply says that you must not enter CTA without a clearance and if you do not intend to ask for a clearance, then you should make sure that you do not enter CTA. I find it difficult to believe that anyone in CASA came up with this unassisted!
