(1) A road management plan may apply, adopt or incorporate any matter contained in any document, code, standard, rule, specification or method formulated, issued, prescribed or published by any authority, person or body whether—
(a) wholly or partially or as amended by the road management plan; or
(b) as formulated, issued, prescribed or published at the time the road management plan is made or at any time before then; or
(c) as formulated, issued, prescribed or published from time to time.
(2) Subject to subsection (3), if a road management plan has applied, adopted or incorporated any matter contained in any document, code, standard, rule, specification or method as formulated, issued, prescribed or published from time to time and that document, code, standard, rule, specification or method is at any time amended, until the road authority causes notice to be published in the Government Gazette of that amendment, the document, code, standard, rule, specification or method is to be taken not to have been so amended.
(3) Subsection (2) does not apply in respect of the amendment of any document, code, standard, rule, specification or method which has been incorporated in a Code of Practice.