Article 2
Member States shall ensure that the driver and passengers occupying the seats of vehicles on the road as referred to in Article 1 wear safety belts or are restrained by an approved restraint system provided the occupied seats are fitted with such equipment. Rear-seat occupants must use equipped seats before others. Member States shall ensure that children under 12 years of age and who are less than 150 cm tall, travelling in such vehicles and occupying belted seats, are restrained by an approved restraint system suitable for the child's height and weight. These seats must be occupied before the others. The use of a restraint system approved by the competent authority of a Member State shall be permitted by the other Member States.