International vehicle registration code system is used for vehicles belonging to the diplomats of foreign countries with license plate from the host country. That system is host country-specific and varies largely from country to country. For example TR on a diplomatic car in the USA indicates Italian, not Turkish. Such markings in Norway are indicated with numbers only, again different from international standards (e.g. 90 means Slovakian. 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.
Vehicle registration plate of the member state in which the vehicle was registered. Lettering on the plate must be black on a white or yellow reflective background. According to the Vienna Convention on Road Traffic, vehicles in cross-border traffic are obliged to display a distinguishing sign of the country of registration on the rear of the vehicle. This sign may either be placed separately from the registration plate or may be incorporated into the vehicle registration plate. With registration plates in the common EU format, vehicles registered in the EU are no longer required to carry an international code plate or sticker for