| WP.29/AC.3/29 | Proposal for the development of either amendments to gtr No. 4 adding a new emission test procedure for heavy-duty hybrid vehicles (HD-HV’S) or a new gtr | |
| WP.29/AC.3/38 | Authorization to extend the scope of the HDH informal group mandate to include alignment of GTR No. 4 and No. 11 | |
| WP.29/AC.3/38 | Authorization to extend the scope of the HDH informal group mandate to include alignment of GTR No. 4 and No. 11 |