44. The expert from Germany reported on the progress made by the informal group on tyre pressure monitoring (TPM) during its meetings held in Bonn on 13-14 October 2008 and on 12 December 2008. He presented their draft proposal for a new regulation for TPMS (ECE/TRANS/WP.29/GRRF/2009/10 and Corr.1) with a number of unresolved issues in square brackets.

45. The expert from OICA introduced GRRF-65-15, GRRF-65-30, GRRF-65-31 and GRRF-65-35 proposing some improvements in the text as well as the technical background for a wider range of under-inflation of the tyres. The expert from the United Kingdom preferred to have a tighter range for the detection of under-inflation, without any tolerance for the accuracy (GRRF-65-36). The expert from ETRTO presented GRRF-65-21 and GRRF-65-22 also supporting a tighter range for the detection of under-inflation for safety reasons.

46. Following a lengthy discussion, the Chairman proposed a compromised text based upon ECE/TRANS/WP.29/GRRF/2009/10 as reproduced in GRRF-65-40. This text includes, for the diffusion test, a pressure threshold of 20 per cent with no tolerance, but could not agree on the cumulative time necessary to warn the driver [30/60] minutes and on the allowance for the inaccuracies of the measuring equipment [5] kPa. These values would be kept in square brackets and should be considered by WP.29 during its forthcoming sessions. The Chairman announced his intention to inform WP.29 of the remaining open issues and to seek, in this respect, the advice of WP.29 at the forthcoming March 2009 session. The expert from OICA renewed his request about the crucial need to improve the accuracy of pressure gauges at service stations. The secretariat was requested to inform the European Garage Equipment Association (EGEA) of this need.

47. Concerning the time frame, the EC expert recalled the group that TPMS requirements would be made mandatory in the European Union by 2012. Therefore, GRRF agreed (with the exception of the expert from Germany) to adopt the TPMS requirements as an amendment to Regulation No. 64, instead of a new draft Regulation. The expert from the EC was requested to produce a revised document to include the agreed TPMS requirements into Regulation No. 64. GRRF requested the secretariat to submit the adopted proposal to WP.29 and AC.1 for consideration at their November 2009 sessions, as draft new series of amendments to Regulation No. 64, subject to a final review by GRRF at its September 2009 session.

48. Concluding the discussion, the Chairman thanked the experts from Germany for developing their proposal and for managing the competing approaches within the informal group.