Commissioner of Main Roads v North Shore Gas Co Ltd

The Commissioner of Main Roads (the Commissioner) appealed to the High Court of Australia against a decision of the Supreme Court of New South Wales, which had upheld a claim by North Shore Gas Co Ltd (the Gas Company) for compensation. The dispute concerned the cost of relocating a gas main owned by the Gas Company, which was necessitated by roadworks undertaken by the Commissioner. The Commissioner argued that the Gas Company was not entitled to compensation for this relocation.

The central legal issue before the High Court was whether the Gas Company had a legal right to compensation from the Commissioner for the expense incurred in moving its gas mains to accommodate the widening of a public road. This involved determining the nature of the Gas Company's rights in relation to the public highway and the extent of the Commissioner's statutory powers and obligations concerning the alteration of such infrastructure.

The High Court, in a majority decision, found in favour of the Gas Company. The Court reasoned that the Gas Company possessed statutory rights to lay and maintain its mains in the public streets, and these rights were not extinguished by the Commissioner's statutory power to alter the roads. The Court held that the Commissioner, in exercising its power to widen the road, was effectively interfering with the Gas Company's existing rights and that the relevant legislation implied a right to compensation in such circumstances. The principle applied was that statutory powers must be exercised subject to existing proprietary and statutory rights, and where interference with those rights occurs, compensation is generally payable unless expressly excluded by statute.

The appeal was dismissed, and the decision of the Supreme Court of New South Wales was affirmed.