50. The Chair of the informal group on GFV reported on the work progress made by the group (GRPE-66-26). He explained that the work of the Heavy Duty Dual-Fuel Task Force (HDDF TF) focused on the proposals discussed under agenda items 4(c) (UN Regulation No. 49). The GFV group also developed the proposals discussed under agenda item 5 (UN Regulation No. 115) and the request by the Working Party on General Safety (GRSG) to GRPE to review, with respect to environmental issues, the proposal to amend UN Regulation No. 110 (specific equipment for CNG/LNG) adopted at its 104th session (GRPE-66-05). He explained that forthcoming work of the GFV group will be aimed to develop a new UN Regulation for heavy duty dual-fuel retrofit.