Commonwealth Consolidated Regulations(1) A fence, free standing wall, building or other similar object, or a series of objects such as trees, booms, marker buoys and other similar objects, may constitute a security barrier if the object or series of objects:
(a) clearly defines the boundary of a maritime security zone; and
(b) deters unauthorised access into the zone.
(2) A security barrier for a land‑side restricted zone or a cleared zone must:
(a) deter and deny unauthorised access to the zone; and
(b) allow detection of unauthorised access to the zone; and
(c) have access control points to permit authorised access, being access control points that do not present less of a barrier to unauthorised access than the surrounding parts of the security barrier; and
(d) be subject to regular patrols, surveillance or other measures that allow inspection of the security barrier for damage, and that detect and deter unauthorised access.