[steve_r]

Originally Posted by TrapezeArtist

Please explain, because the creation of the virtual wall seems to me to be the only possible problem with your idea.

Moving on to penalties, I think a "penalty chicane" might be the way to do it. The design would be somewhat dependent on the geography of the circuit but ideally would involve a loss of about 5 seconds and safely feed back onto the main circuit. For a minor infringement, one pass through the penalty chicane on the next lap. For something more serious, two or three passes on consecutive laps.

Like a long lap loop in MotoGP.