Sir Humphrey makes good sense. Raise the matter at the next AGM, assuming the parking you refer to is truly a problem. Include commentary as to what problems you have endured or witnessed – and for how many years – when illegal parking takes place.
You could fast track this by submitting a motion to the Strata Committee ASAP. Do not wait until you’re told there is an AGM coming up or worse, first hearing about the AGM when you receive the Agenda is the post, because by then you may be too late to submit a motion (note many strata schemes do not extend owners the courtesy to submit motions for listing in the Agenda of an AGM).
You could propose a by law to the effect that anyone who owns a lot or leases a lot or resides in a lot or works at a lot at the scheme irrespective of whether said lot has or does not have access to a car space (or spaces), is prohibited from using the visitors’ car spaces for any time for any reason without prior written approval from the Strata Committee.
In the above suggestion, “lot” includes both commercial and residential premises.
See what the strata committee come back to you with.