Vehicle registration plates of Mexico Vehicle registration plates of Mexico Vehicle registration plates of Mexico are issued with unique visual designs by each state, but with a single national numbering system, such that serials are not duplicated in multiple states. Most states change designs approximately every three years, with each state having its own plate replacement cycle. Every year, owners of Mexican-registered vehicles pay the "tenencia" or "revalidación de placas" (car plates renewal tax). A set of Mexican plates includes one pair of plates, a windshield sticker, and in some states a plate sticker. The international code for Mexico is "MEX". In 2001 the size
International vehicle registration code International vehicle registration code The country in which a motor vehicle's vehicle registration plate was issued may be indicated by an international licence plate country code, formerly known as an International Registration Letter or International Circulation Mark. The sign must be displayed on the rear of the vehicle. The sign may either be placed separately from the registration plate, or be incorporated into the vehicle registration plate. The allocation of codes is maintained by the United Nations Economic Commission for Europe as the "Distinguishing Signs Used on Vehicles in International Traffic" (sometimes abbreviated to DSIT), authorised by the UN's Geneva