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 Trinidad and Tobago with first Series Classifier then another letter which was A (Private vehicles would be PA 1, PA 2 then PA 3 etc. - PA 9999) . For a commercial vehicle TA. It started at PA 1 and ended at PA 9999. At the end of the end of that series, a new "series" was issued being PB. And so it continued. Upon the exhaustion of Registration number (PZ 1- 9999), The authority then added another letter and began PAA, or TAA for a commercial vehicle, and HAA for a taxi. The first registration number in that "series" being PAA 1,