51   Appropriate authority for the purposes of this Division

For the purposes of this Division, a person has appropriate authority to install or display (or to interfere with, alter or remove) a prescribed traffic control device if:

(a)  the person is a public authority that has been directed by the Authority under Division 1C of Part 6 of the Transport Administration Act 1988 to install or display (or to interfere with, alter or remove) the device, or

(b)  the person is otherwise authorised in writing by the Authority to install or display (or to interfere with, alter or remove) the device.

Note. Division 1C of Part 6 of the Transport Administration Act 1988 enables the Authority to give certain public authorities directions in respect of safety and traffic management.