The sign appears to read;
'No person or vehicle is permitted beyond this point unless authorised in writing by the officer in charge of aerodrome operation.'
I am not a Lawyer (wouldn't want to be one either) but to me the sign's wording could indicate that the 'Officer in charge' of that particular aerodrome, ie Yarrawonga, must give you written approval to enter the tarmac area.
One of the best examples of poorly thought out, bureaucratic bungling I have seen in ages!
The Council obtained legal advice on its wording? Yeah, right!
