Vehicle registration plates of the Republic of Ireland Vehicle registration plates of the Republic of Ireland In the Republic of Ireland, vehicle registration plates (commonly known as "number plates") are the visual indications of motor vehicle registration – officially termed "index marks" – which it has been mandatory since 1903 to display on most motor vehicles used on public roads in Ireland. The alphanumeric marks (or "registration numbers") themselves were issued by the local authority in which a vehicle is first registered. The current specification for number plates is the format YYY–CC–SSSSSS. Those issued from 1987 to 2012 had the format YY–CC–SSSSSS. The components are: Since 1991, the
Vehicle registration plates of Arizona Vehicle registration plates of Arizona The U.S. state of Arizona first required its residents to register their motor vehicles in 1912. Registrants provided their own license plates for display until 1914, when the state began to issue plates. Plates are currently issued by the Motor Vehicle Division of the Arizona Department of Transportation (MVD). Plates were issued to all vehicle types until 1929, when commercial vehicles were issued their own class of plate. County codes were used from 1922 through 1958, while the current "Grand Canyon State" slogan first appeared in 1940, appearing on all subsequent issues except for 1945.