38. The Chair recalled that GRRF already supported ECE/TRANS/WP.29/GRRF/2016/44 with editorial corrections and that this document was kept on the agenda, awaiting substantive proposals to be considered at the coming session.

39. The expert from ETRTO presented ECE/TRANS/WP.29/GRRF/2017/21 proposing corrections to paragraph references due to amendments to Regulation No. 30. GRRF agreed with the proposal as reproduced in Annex IV of the session report.

40. GRRF requested the secretariat to submit ECE/TRANS/WP.29/GRRF/2016/44 as well as ECE/TRANS/WP.29/GRRF/2017/21 amended as draft Supplement 1 to Regulation No. 142, for consideration and vote by WP.29 and AC.1 at their March 2018 sessions.

41. The expert from OICA introduced GRRF-84-33, presenting the results of a study aimed at evaluating the effectiveness of Tyre Pressure Monitoring Systems in general and especially indirect and direct systems by comparing the actual tyre inflation pressures with the individual recommended pressures. The expert offered to share the details of the study on request. The expert from ETRTO offered to review the study.

42. No information was presented on existing regulations and laws on the mandatory use of TPMS.