The legislative framework
12 Road Rule 15 defines a vehicle as including a motor vehicle as well as other types of transportation.
13 The Dictionary to the Rules defines motor vehicle as meaning a vehicle that is built to be propelled by a motor that forms part of the vehicle.
14 Truck is defined as meaning a motor vehicle with a gvm over 4.5 tonnes, except a bus, tram or tractor.
15 Those definitions have the result that all trucks are vehicles, but only some vehicles are trucks. Furthermore, by reason of those definitions a sign requiring vehicles over 8t gvm to do something would necessarily include all trucks over 8t gvm but would not include all trucks. However, each of the Defendants was prosecuted under r 105. That required the driver only to enter the area indicated when such driver drove past a "Trucks must enter" sign. There was no such sign erected at any point prior to the Marulan Heavy Vehicle Checking Station. The Magistrate took the view that the signs in fact erected did not even substantially comply with the sign identified in r 105.
16 The RTA does not now dispute that the sign itself was ultra vires r 105. The RTA argues, however, that notwithstanding that fact, the Defendants were obliged to comply with the sign because they amounted to an instrument and under s 32(1) Interpretation Act 1987 an instrument is to be construed as operating to the full extent of but not in excess of the power conferred by the Act under which it is made. In other words, to the extent that the sign required other than trucks to enter the heavy checking station, the sign should be read down in accordance with s 32(1).
17 Section 3(1) of the Interpretation Act defines "instrument" in this way:
instrument means an instrument (including a statutory rule or an environmental planning instrument) made under an Act, and includes an instrument made under any such instrument.
18 The Road Rules 2008 are made pursuant to s 72A Road Transport (Safety and Traffic Management) Act 1999. They are therefore "statutory rules", with the result that they themselves are an instrument within the meaning of the definition in the Interpretation Act.
19 Apart from what it is said to include, the definition of instrument under the Interpretation Act is circular. Halsbury's Laws of England (4th ed, 2007) says this:
The word 'instrument' as applied to a writing may ... include documents which affect the pecuniary position of parties although they do not create rights or liabilities recognised in law; but usually it applies to a document under which some right or liability, whether legal or equitable, exists.
20 The definition given in Stroud's Judicial Dictionary Of Words And Phrases (7th ed, 2006) is this:
An "instrument" is a writing, and generally imports a document of a formal legal kind.
21 The RTA points to certain provisions in Pt 20 of the Road Rules which contain reasonably precise requirements for traffic control devices and traffic signs.
22 The definition of "document" in the Evidence Act 1995 is this:
document means any record of information, and includes:
(a) anything on which there is writing, or
(b) anything on which there are marks, figures, symbols or perforations having a meaning for persons qualified to interpret them, or
(c) anything from which sounds, images or writings can be reproduced with or without the aid of anything else, or
(d) a map, plan, drawing or photograph.
23 In addition, the RTA points to the meaning of "document" in the Oxford English Dictionary (2nd ed, 1989) which has as its fourth meaning:
Something written, inscribed, etc, which furnishes evidence or information upon any subject, as a manuscript, title-deed, tombstone, coin, picture, etc.
24 Of course, in this age of technology, computers and electronics it is accepted that a document might be a component part of a computer such as a hard drive because that drive, when properly interpreted contains (as the Evidence Act allows) marks, figures, symbols or perforations which have meaning for a person who can interpret them.
The RTA's contentions
25 The RTA argues, therefore, that a road sign is by virtue of the definition in the Evidence Act, a document. It says an instrument is a formal legal document in the manner I have described earlier, with the result that any road sign in accordance with the Road Rules is "an instrument made under" the Road Rules which are themselves an instrument.
26 The RTA then points to s 32 Interpretation Act which provides:
32 Instruments to be construed so as not to exceed the powers conferred by the Acts under which they are made
(1) An instrument shall be construed as operating to the full extent of, but so as not to exceed, the power conferred by the Act under which it is made.
(2) If any provision of an instrument, or the application of any such provision to any person, subject-matter or circumstance, would, but for this section, be construed as being in excess of the power conferred by the Act under which it is made:
(a) it shall be a valid provision to the extent to which it is not in excess of that power, and
(b) the remainder of the instrument, and the application of the provision to other persons, subject-matters or circumstances, shall not be affected.
(3) This section applies to an instrument in addition to, and without limiting the effect of, any provision of the instrument or of the Act under which it is made.
27 In this way, it is argued, although the sign in question is not authorised by r 105 because r 105 does not authorise the sign to direct all vehicles over 8t GVM to enter the weighing station, the sign should simply be construed as operating to the full extent of the power that r 105 does in fact authorise. The result, it is said, is that because the sign could authorise a truck (as defined) to enter, it should effectively be read as if that was all it directed and nothing more. In that regard, Mr Lynch took me to what Dixon J said in Bank of NSW v Commonwealth (1948) 76 CLR 1 at 371. In the passage which follows, Dixon J was discussing the effect of what can be described as a severability clause to deal with the possibility that certain legislation might be found to be unconstitutional. Dixon J said:
The effect of such clauses is to reverse the presumption that a statute is to operate as a whole, so that the intention of the legislature is to be taken prima facie to be that the enactment should be divisible and that any parts found constitutionally unobjectionable should be carried into effect independently of those which fail. To displace the application of this new presumption to any given situation arising under the statute by reason of the invalidation of part, it must sufficiently appear that the invalid provision forms part of an inseparable context. The general provision contained in s. 15a of the Acts Interpretation Act 1901-1941 produces this effect, as does s. 46 (b), which similarly deals with severance in subordinate legislation.
28 Similarly, attention was directed to what Preston J said in Caroona Coal Action Group Inc v Coal Mines Australia Pty Ltd and Minister for Mineral Resources (No 2) (2010) 172 LGERA 25 in a matter that concerned an exploration licence which was granted by an Instrument of Renewal issued by the relevant Minister. Under s 114(3) of the Mining Act 1992 the period for which an authority is renewed may not on any one occasion exceed 5 years. The Minister renewed the authority to 28 February 2011 when the earlier instrument was due to expire 5 years prior to that on 1 March 2006. However, the Minister inserted the date 22 February 2006 but left the expiry date as to 28 February 2011, that is, a period in excess of the 5 year period.
29 Preston J said:
[80] I agree with the submissions of CMA and the Minister that A216 should be construed as operating to the full extent of, but so as not to exceed, the power conferred by s 114(3) of the Mining Act . This means that the period for which A216 should be construed as having been renewed is up to but not exceeding five years, that is to say, until 22 February 2011 rather than 28 February 2011.