Portaria n. 1223/93 de 23/11/1993. Estabelece o calendário para as inspecções periódicas obrigatórias de veículos automóveis. Diário da República I Série B n. 274 de 23/11/1993 Página 6492

This Portuguese regulation establishes the mandatory calendar and frequency for periodic technical inspections of motor vehicles. It ensures that vehicles on the road meet safety and environmental standards through regular official checks. This affects all owners of motor vehicles in Portugal, requiring them to adhere to specific inspection intervals to maintain legal roadworthiness.