Proposal by the WP.29 secretariat to consider amending the Consolidated Resolution to adhere with provisions of the UN Regulations concerning noise limits. Presently, the resolution (which provides a framework and general reference for UN Regulations) permits a 5 db(A) tolerance in measuring noise levels while the UN Regulations 51, 41 and 63 referred to in the resolution permit narrower margins of 1 db(A) or 3 db(A).
28. GRB considered document GRB-59-01 in which the secretariat proposed to correct the reference to Annex 3 of UN Regulation No. 41 in paragraph 8.8.2.1.2. of the Consolidated Resolution (R.E.3) as well as to draw the attention of the Working Party to the fact that the margin of 5 dB(A) defined in paragraph 8.8.2.2., in order to take into account the possible instrumental and measurement errors, substantially exceeds the respective margins of 1 or 3 dB(A) set out in Regulations No. 51, 41 and 63. The experts from France, Germany, Sweden, IMMA, ISO and OICA pointed out that the figure of 5 dB(A) in paragraph 8.8.2.2. takes into account the disturbances and scatter of measurements performed under real-life conditions, in uncertain acoustic environment (e.g. side of a road) and by untrained staff (e.g. road police), while the margin of 3 dB(A) is intended for laboratory conditions and trained staff. GRB decided to leave the figure of 5 dB(A) in paragraph 8.8.2.2. of R.E.3 unchanged.