| 5.3. | An approval number shall be assigned to each type approved. Its first two digits (at present 02, corresponding to the 02 series of amendments which entered into force on 1 July 1985) shall indicate the series of amendments incorporating the most recent major technical amendments made to the Regulation at the time of issue of the approval. A Contracting Party shall not assign the same number to another type of retro-reflecting device covered by this Regulation except in the case of an extension of the approval to a device differing only in colour. | a0c0 |