International vehicle registration code registration plate. When the distinguishing sign is incorporated in the registration plate, it must also appear on the front registration plate of the vehicle. The requirement to display a separate distinguishing sign is not necessary within the European Economic Area, for vehicles with license plates in the common EU format which satisfy the requirements of the Vienna Convention, and so are also valid in non-EU countries signatory to the convention. Separate signs are also not needed for Canada, Mexico and the United States, where the province, state or district of registration is usually embossed or surface-printed on the vehicle registration
Vehicle registration plates of Luxembourg ownership. There is no market for trading numbers privately. Plates originally comprised digits only. (Four- and five-digit numbers can still be issued on request, but lower numbers are withheld from private use once the car is taken off the road.) More recently, combinations of one letter and four digits, then two letters and three digits, were introduced, but these are no longer issued and are therefore gradually disappearing. The rear number plate latterly featured a large EU flag without a country code. A new registration number is allocated each time a car with a number in the old format changes