| 13.4. | Approvals granted under this Regulation earlier than 24 months after the date of entry into force of Supplement 4 and all extensions of approvals, granted subsequently, shall remain valid indefinitely. When the type of special warning lamps approved to a preceding version of the Regulation up to its Supplement 3 meets the requirements of this Regulation as amended by Supplement 4, the Contracting Party which granted the approval shall notify the other Contracting Parties applying this Regulation thereof. | a0c0 |