25. GRE reviewed a candidate UN Regulation No. 27 (Advance warning triangle) that was proposed to be added in Annex 4 to UN Regulation No. 0 under Phase 2 of the International Whole Vehicle Type Approval (IWVTA) (WP.29-176-21) and decided that this was not necessary. At the same time, GRE highlighted the need to include in IWVTA, with high priority, the three new simplified UN Regulations on LSD, RID and RRD.