| WP.29-173-06 | PTI: Report to WP.29 about results of the 8th meeting of Informal Group on Periodical Technical Inspections | |
| WP.29/2017/134 | Proposal for a new UN Rule [No. 3] on Periodical Technical Inspections of motor vehicles using natural gas in their propulsion system | |
| WP.29-173-12 | Amendments to the proposal for a new regulation on inspections of gaseous-fueled vehicles | |
| WP.29-165-07 | Proposals for futher development and improvement of the 1997 Vienna Agreement | |
| WP.29-147-11 | Proposal for the 1997 Vienna Agreement development |