In this Part—
insurer means a body corporate authorised under the Insurance Act 1973 of the Commonwealth to carry on insurance business.
wrecked, for a heavy vehicle, means the vehicle is—
(a) demolished or dismantled; or
(b) in a state or condition prescribed by the national regulations.
written-off, for a heavy vehicle, means the vehicle can not reasonably be expected to be repaired, including because—
(a) an insurer has decided the vehicle should not be repaired; or
(b) the vehicle is in a state or condition prescribed by the national regulations.