| WP.29/2017/93 | Proposal for a new Rule No. 3 on Periodical Technical Inspections of motor vehicles using Compressed Natural Gas and/or Liquefied Natural Gas in their propulsion system | |
| WP.29-172-17 | Draft proposals for further items related to periodical technical inspections to be treated by the PTI informal group or WP.29 | |
| WP.29-172-19 | Proposal for Rule No. 4 on safety requirements for hybrid and electric vehicles | |
| WP.29-172-18 | Draft amendments to the proposal for a new UN Rule on the inspection of CNG/LNG-powered vehicles | |
| WP.29-172-18 | Draft amendments to the proposal for a new UN Rule on the inspection of CNG/LNG-powered vehicles | |
| WP.29-172-19 | Proposal for Rule No. 4 on safety requirements for hybrid and electric vehicles |