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 plates of Norway of a bar code, and changed colour every year on a three-year cycle: red, blue and yellow. The use of validation stickers was discontinued from May 2012. The police will now rely on automated systems which photograph the number plate, identify the registration number using optical character recognition, and check the car's status in a database. Norwegian plates manufactured after 1 November 2006 have a nationality stripe on the left end of the plates. This stripe is blue with Norway's national flag and international vehicle registration code "N", in a similar format to that used by many central European countries