8. GRE resumed considering of the principle “prohibited if not allowed” for the lamp installation according to UN Regulation No. 48 and noted a draft paragraph 5.22. being discussed within IWG SLR: “The fitting of any lighting and light-signalling device or function, other than those mentioned in paragraph 6, is prohibited for the purposes of granting a type-approval according to this Regulation”. The expert from OICA proposed to add several exceptions to this draft paragraph (GRE-93-21). Following a short discussion, GRE requested IWG SLR to continue consideration and invited all GRE experts to provide their contributions.