Riessen v the State of South Australia No. Scciv-99-396

The case before the court involved Riessen, who was issued an expiation notice for speeding in a school speed zone in West Beach, South Australia. The plaintiff argued that the speed zone was not validly created and sought restitution of the $183 expiation fee she paid. The key legal issues were whether the speed zone was validly established and whether the plaintiff was entitled to restitution of the expiation fee under the principles of unjust enrichment. The court examined the relevant sections of the Road Traffic Act 1961 and concluded that the Minister had the power to establish speed zones with specified operating hours, and there was no repugnancy between the relevant sections of the Act. The court also found that the Expiation of Offences Act 1996 provided a comprehensive scheme for the expiation of minor offences, which excluded the common law principles of restitution and unjust enrichment. Therefore, the plaintiff's claim for restitution of the expiation fee was dismissed.

The court's reasoning was based on the interpretation of the relevant statutory provisions and the nature of the expiation scheme. The court held that the Minister had the power to establish speed zones with specified operating hours, as it was an appropriate aid to the safe and efficient movement of traffic and pedestrians. The court also found that the Expiation of Offences Act 1996 provided a comprehensive scheme for the expiation of minor offences, which excluded the common law principles of restitution and unjust enrichment. The court held that the plaintiff's payment of the expiation fee was voluntary, as she was aware of her choices and made a calculated decision not to elect to be prosecuted. Therefore, the plaintiff's claim for restitution of the expiation fee was dismissed. The court's decision was based on the interpretation of the relevant statutory provisions and the nature of the expiation scheme, which provided a comprehensive code governing the expiation of minor offences.