In the Republic of Ireland, the term "taxi" is reserved for vehicles that may pick up on streets and where the fare is determined by a meter. Taxi vehicles do not have to be a particular colour but all carry a distinctive roofsign with the licence number prominently displayed, some with the Irish word "TACSAÍ" instead of the usual "TAXI", also a sticker or stickers that determine their boundaries by county, these stickers carry a letter or letters that reflect the number plate county code (e.g. D=Dublin, MH=Meath etc.) (for full list see vehicle registration plates of Ireland). And as of January 2013, a green and blue "TAXI" sticker is required on the front doors. In September 2006 a nationwide taxi fare system was introduced so that charges no longer depend on the county or city council area.