Working draft of Annex 9 (Test procedure using the HILS method) and Annex 10 (test procedure using the powertrains method) of the amendment to GTR No. 4 (heavy-duty vehicle emissions and fuel consumption) to introduce provisions for heavy-duty hybrid vehicles, prepared by the drafting subgroup of the HDH informal working group.

HDH drafting group working draft of the consolidated revision of GTR No. 4 to include provisions for heavy-duty hybrid vehicles.

Working draft of the annex to specify the hybrid heavy-duty vehicle engine emissions and fuel efficiency measurement procedure using the hardware-in-the-loop method.