Nilson v South Australia

Arthur Edward Nilson, representing owners of commercial motor vehicles registered in other Australian states, brought an action against the State of South Australia and its officials. The dispute concerned the application of South Australian road traffic legislation, specifically provisions requiring the registration of motor vehicles and the payment of associated fees, to vehicles used exclusively for inter-state trade. The case was heard in the High Court of Australia.

The central legal issue before the court was whether the South Australian Road Traffic Act 1934-1954, and in particular an amendment to its regulations that removed an exemption for heavy vehicles, imposed a tax or burden on inter-state trade that was inconsistent with Section 92 of the Australian Constitution. The court was asked to determine if these provisions could validly apply to vehicles engaged solely in inter-state commerce.

The court reasoned that the registration fees imposed by the South Australian Act, particularly for commercial motor vehicles, constituted a tax on inter-state trade. This was found to be inconsistent with the freedom of inter-state trade, commerce, and intercourse guaranteed by Section 92 of the Constitution. Consequently, the amending regulation that removed the exemption for vehicles weighing two and a half tons or more was declared void in its application to vehicles registered in other states. The court also held that certain sections of the Road Traffic Act could not apply to the plaintiff and those he represented while their vehicles were used exclusively for inter-state trade, as registration could not be separated from the payment of the fee.

The court declared that so long as the commercial motor vehicles in question were used exclusively for inter-state trade, commerce, or intercourse, the plaintiff and the persons he represented, along with their drivers, were not subject to the operation of specific sections of the Road Traffic Act. Furthermore, the court declared that the amending regulation of 23rd December 1954 was invalid, except in its application to Territories. The defendants were ordered to pay the costs of the special case.