The definition of 'advertisement' in s 4 of the Development Act 1993 (SA) extends to political, religious and social messages and is not limited to commercial advertising. The display of political signs on residential property is not reasonably incidental to residential use where the signs are large, numerous and have a detrimental impact on amenity. An enforcement order under s 85 requiring removal of signs displayed without development approval does not impermissibly burden the implied freedom of political communication, as it is reasonably appropriate and adapted to ensuring compliance with s 32 and does not preclude the person from seeking development approval or using other forms of communication.
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