Motor Vehicles (Specified Restrictions) Regulations (Northern Ireland) 1998
Under Article 19A of the Road Traffic (Northern Ireland) Order 1981 (“the 1981 Order”), a person who has passed a test of competence to drive in order to obtain a driving licence must, for a period of 12 months, display a distinguishing mark on his vehicle and must not exceed 45 miles per hour while driving on any road.