Alternate license plates can be assigned to motor vehicles designed and built for passenger transport with no more than eight seats except the driver's seat (class M1), motorcycles and light quadricycles (class L vehicles), and trailers up to 750 kg maximum permissible mass (class O1), e.g. two passenger cars, or one passenger car and one motor home, or two motorcycles, or two light trailers, but not two vehicles of different classes, e.g. one passenger car and one motorcycle.
Of the vehicles registered with interchangeable license plates, one or both may also be classic cars. The letter H of the classic car license plate is then affixed to the vehicle-related part of the interchangeable license plate. The same applies to vehicles that are allowed to carry an E license plate. The restriction to the same license plate sizes ensures that the proper prescribed illumination of the rear license plates is guaranteed.
The interchangeable license plate consists of two parts: a part that remains on the vehicle and an attachable additional part, by which a vehicle is registered for use on the road. The identification numbers of a changeable license plate are the same except for the last digit. The last digit of the vehicle's identification number is placed on the vehicle-related part of the license plate. The remaining part of the identification number of the interchangeable license plate is applied to the interchangeable part.