of freedom of inter-State trade, commerce, and intercourse, I do not find it necessary to say more than that I concur in the order proposed.
TAYLOR J. In the second of these suits the plaintiff company, which operates motor vehicles upon the roads of South Australia and other States in the course of inter-State trade and commerce, seeks a declaration that a number of the provisions of the Road and Railway Transport Act 1930-1956 (S.A.) are invalid, or, alter- natively, that those provisions are inapplicable to its vehicles whilst they are being driven on public roads in South Australia in the course of or for the purposes of inter-State trade commerce and intercourse. Similar declarations are sought with respect to the regulations made under the Act, and, in particular, with respect to regs. 1, 2, 3, 4, 5, and 6.
The statutory provisions which are impugned were introduced by the Road and Railway Transport Act Amendment Act 1956, which came into operation on 1st February 1957, and they relate to the imposition of road charges upon the owners of "unregistered com- mercial vehicles which expression, in the singular, is defined to mean a motor vehicle the tare weight of which is two and one-half tons or more, and which is not registered under the Road Traffic Act 1934-1955. It is conceded that the plaintiff's vehicles are vehicles in this category and it is of some importance to appreciate the reason for and the significance of this fact before proceeding to examine the legislation in question.
Section 7 of the Road Traffic Act provides that no person shall drive any motor vehicle on any road unless that vehicle has been registered under Pt. II of the Act and unless the registration thereof is for the time being in force. The prohibition erected by this section is subject to some minor exceptions but they are of no materiality
SO far as this case is concerned. Provision is made by S. 8 for the making of applications for registration and for the payment of prescribed fees and, by sub-s. (2) of that section, it is provided that upon application duly made and payment of the fee as required by sub-s. (1) the registrar shall register the motor vehicle in the register of motor vehicles for a period of either six or twelve months, at the option of the person applying for registration, and shall assign a number to the vehicles. Annual registration fees for vehicles are prescribed by S. 9 and these are calculated by reference to the "power-weight" (P.W.) of a vehicle, that is, the figure ascertained
by adding the weight in hundredweights of the vehicle to the horsepower calculated as thereinafter mentioned. From sub-s. (4)