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TYREROAD NOISE LIMITATION  r50(a)aavRegulation No. 30 (Pneumatic tyres)  r5x0Documentation: TRANS/WP.29/GRB/R.140; TRANS/WP.29/GRB/R.144; informal documents Nos. 7, 8 and 9 of the annex to this report.  r503.aavThe expert from Germany introduced documents TRANS/WP.29/GRB/R.140 and TRANS/WP.29/R.141 (see para. 15 below) containing the proposals incorporating tyreroad noise provisions into Regulations Nos. 30 and 54.  r5 04.aavHe recalled that the proposals had been based on the coastby measuring method using the ISO 10844:1994 test track, as proposed earlier by France (TRANS/WP.29/GRB/R.129) and that they had regarded the suggestions by ETRTO and the Nordic Countries, submitted also to the European Commission's ERGA-Noise III group. He indicated that implementation of these proposals was expected to remove approximately 25 per cent of the noisiest tyres existing on the present market. He mentioned the noise limits and the categorization of tyres for Regulation No. 30 tyres into twotread construction categories with the noise limits specified according to the load capacity index range. (For Regulation No. 54 tyres see para. 15 below).  r505.aavAs a counter proposal, the expert from "Rthe ETRTO presented document TRANS/WP.29/GRB/R.144 containing a proposal for a separate draft Regulation concerning tyreroad noise limitation with the noise limits established on the basis of tyre width (instead of tyre load index as in the proposal by Germany mentioned in paragraph 4 above).  r5806.aavThe expert from OICA contributed to the discussion by presenting a comparison between the proposals by Germany (TRANS/WP.29/GRB/R.140 and TRANS/WP.29/GRB/R.141), the draft European Commission proposal (III/5275/96EN) and the proposal by ETRTO (TRANS/WP.29/GRB/R.144). He pointed out the differences between the limit values and methods of their assessment. He also expressed the opinion that a motor vehicle fitted with noise approved tyres would not automatically comply with the noise limits set in Regulation No. 51. He suggested that a two axle trailer should also be accepted as a test vehicle. He wished to have a technical demonstration proving that safety properties of the tyres would not be impaired by noise emission reductions (informal document "R No. 7).  r5!07.aavThe expert from the United Kingdom presented an assessment of the tyre noise type approval method that was considered by the Meeting of Experts and parallel to that considered in the EC. He presented the results of research carried out by the Transport Research Laboratory and recommended the Meeting of Experts to introduce a tyreroad noise test only in conjunction with an appropriate test method designed to ensure an adequate tyre adhesion and safety performance. He suggested that the proposed ISO test surface should not be used for tyre noise testing until further information about its representativeness was available and recommended that an additional reference surface be developed in order to provide a test condition that would be"(|,))-," representative of operation on European high speed roads. He also expressed the opinion that tyres should be tested at two different speeds and suggested that the higher test speeds should be increased to 110 km/h for car tyres and to 90 km/h for commercial vehicles. Other proposals of the report related to temperature correction, measurement conditions, and to the simplification of the test method.  r5x08.aavThe expert from the Russian Federation proposed to allow a minimum ambient temperature of 0 $C instead of 5 $C for tyreroad noise measurement. In this relation, the expert from ISO confirmed that in the ISO working group responsible for the revision of standard ISO 362:1981 a value of 0 $C had been supported.  r5( 09.aavThe expert from the Netherlands pointed out the importance of the differences between testing surfaces which can affect the test results. Hesupported in principle the views expressed by the United Kingdom (see para.7 above).  r5010.aavThe experts from France and Germany appreciated the abovementioned contributions. However, they said that in view of the already available results the ISO 10844:1994 test track surface should be used as a reference for tyreroad noise limitation.  r5011.aavThe expert from ETRTO stated that tyre noise tests had been made on different test tracks equipped with an ISO 10844:1994 surface. However, the test results exhibited some unexpected differences. He was of the opinion that a further step would be necessary before setting the tyre noise procedure and expressed his disagreement with the noise limits considered by the Meeting of Expert (see paras. 3 and 4 above). He recalled his proposal for a separate tyre noise Regulation in order to make a clear distinction among the already approved tyres that, in his opinion, should not undergo the noise prescriptions and the new type of tyres to which the noise Regulation should be addressed (see para. 5 above).  r5012.aavThe expert from the United States of America suggested that a stepbystep approach should be adopted by the Meeting of Experts in dealing with the subject. He proposed to deal firstly with the test track definition and with the test procedure and to discuss later the safety aspect as well as the noise limits and their assessment.  r5@013.aavIn order to resolve the differences in opinions, the Meeting of Experts agreed to set up two task groups aimed at studying (a) test methods and (b) test surfaces. It was agreed that the group responsible for studying test methods should be chaired by Dr. Lukaszewicz from Germany and the group responsible for studying the test surfaces by Mr. Van Blokland from the Netherlands. The Chairman of the Meeting of Experts agreed to propose to the Working Party on the Construction of Vehicles at its next session in March 1997 to approve the mandates to the abovementioned groups. With respect to the future work of the Meeting of Experts, it was agreed that the aspects related to safety (tyre adhesion properties) should be studied in close cooperation  r5'0with the Meeting of Experts on Brakes and Running Gear.  "(|,))-,"Ԍ r5014.aavThe Meeting of Experts agreed to consider in detail at its next session the proposals by Germany for amending Regulations Nos. 30 and 54 (see para. 15 below), taking into account the proposals by ETRTO as well as the proposals  r5X0expected to be furnished by the task groups (see para. 13 above). K!K!  r50(b)aavRegulation No. 54 (Pneumatic tyres for commercial vehicles)  r5x0Documentation: TRANS/WP.29/GRB/R.141; TRANS/WP.29/GRB/R.144; informal documents Nos. 7, 8 and 9 of the annex to this report.  r5015.aavConsideration of this item was held in conjunction with the proposal related to tyre noise limitation of passenger cars, with the parallel conclusions (see paras. 314 above). In describing the basic philosophy of document TRANS/WP.29/GRB/R.141, the expert from Germany pointed out the separate consideration of tyres for light commercial vehicles and tyres for heavy commercial vehicles, with the limits specified in each group for three tread construction categories. AMENDMENTS TO NOISE REGULATIONS RELATED TO TWO AND THREEWHEELED VEHICLES  r5h0(a)aavRegulation No. 9 (Noise of threewheeled vehicles)  r50Documentation: TRANS/WP.29/GRB/R.119/Rev.1.  r5016.aavIn the resumed consideration of the proposal, the expert from Spain informed the Meeting of Experts about the amendments recently agreed in the EC and suggested that they should be introduced in the proposal as soon as they were officially approved.  r5p017.aavHe mentioned in particular that it had been proposed in the EC that for L2 category vehicles the noise limit should be 76 dB(A) whilst for L4 and L5 categories it should be 80 dB(A). Other modifications mentioned related to the measurement method and the calculation of its results.  r5X018.aavResponding to a question by the expert from the United States of America, the expert from IMMA expressed his opinion that a tyreroad noise test would not be necessary for threewheeled vehicles because they represent a small percentage of the total fleet. The expert from ETRTO added that the average speed of these vehicles is very low (under 20 km/h) as they usually run in urban areas only.  r5 019.aavThe Meeting of Experts agreed that, until a final decision was taken in the EC, the proposal for amending Regulation No. 9 should not be further revised and that its consideration should be resumed at the next session, awaiting additional information from the EC.  r5$0(b)aavRegulation No. 63 (Noise of mopeds)  r5H&0Documentation: TRANS/WP.29/GRB/R.121/Rev.1.  r5'020.aavThe expert from Spain informed the Meeting of Experts about the agreements reached in the EC and highlighted the changes to be introduced in"(|,))-," his proposal in order to align it with the corresponding draft Directive.  r5021.aavNoting the parallel with the proposal for draft amendments to Regulation No. 9 (see paras. 16 to 19 above), the Meeting of Experts deferred consideration of this item to the next session, awaiting additional information from the EU.  r5x0(c)aavRegulation No. 92 (Replacement silencing systems for motorcycles)  r50Documentation: TRANS/WP.29/GRB/R.122/Rev.1; TRANS/WP.29/GRB/R.126/Rev.1.  r5022.aavConsideration of this item was deferred to the next session for the reasons identical with paragraphs 20 and 21 above.  r5 023.aavThe expert from France noted some editorial errors in the French version of document TRANS/WP.29/GRB/R.122/Rev.1 and agreed to communicate the corrections to the secretariat.  r5024.aavThe expert from Germany gave a brief presentation showing the main differences existing between the proposal of the EU Directive and the ECERegulations concerning the noise of two and threewheeled vehicles, particularly with respect to vehicle classes (maximum speed and engine capacity) and the relevant noise limits. AMENDMENTS TO REGULATION No. 51 (Noise of M and N categories of vehicles)  r50Documentation: TRANS/WP.29/GRB/R.142, informal documents Nos. 1, 5, 10, 11 and 13 of the annex to this report.  r5p025.aav At the request of the expert from the Russian Federation, the proposal for a draft Corrigendum to Regulation No.51, Revision 1, referring largely to the Russian text (TRANS/WP.29/GRB/R.142), was withdrawn from consideration. He suggested that a more complete corrigenda to the Russian text would be provided to the secretariat in order to publish it (Russian only).  r5 026.aavThe expert from the Russian Federation introduced also informal document No. 1 aimed to reintroduce into the Regulation provisions necessary for testing of certain vehicles equipped with automatic transmissions. The Meeting of Experts agreed to consider the proposal in detail at its next session and requested the secretariat to distribute it with an official symbol.  r5 027.aavThe expert from ISO presented informal document No. 10 concerning the modification of the test method (ISO 362:1981) in order to improve its repeatability and reproducibility. He indicated that the major changes comprised the use of ISO 10844:1994 test track, change of the driving cycle, requirement of periodic instrumentation calibration and the possibility to allow reduced depth of the tyre in order to suppress the noise emitted by tyres. The draft revision of the standard, ISO/DIS 362, was distributed as informal document No. 11.  r5'028.aavThe expert from OICA presented results of a research concerning light vehicle exterior noise (informal document No. 13). The research had been"(|,))-," carried out in order to evaluate the correlation between existing ISO test procedures and typical urban driving cycles and to determine the correlation of passby noise results from an indoor noise facility (USA procedure) with results obtained at outdoor noise test tracks. The main findings were that the current acceleration test method did not correlate well with urban driving conditions in terms of speed and acceleration rate for a particular gear; furthermore, the exterior passby noise was highly speed dependent and only mildly dependent on engine speed or acceleration. The use of shaved tyre tread (reduced tread depth) greatly reduced the difference between indoor and outdoor passby sound levels.  r5029.aavThe expert from Japan contributed to the discussion by presenting the results of an investigation made into urban driving modes in his country (informal document No. 5). He said that it should be possible to set a representative test condition for urban tests under acceleration by specifying the initial and terminal acceleration conditions in relation to the vehicle power/mass ratio.  r5030.aavThe expert from Germany gave an interim report on the research project carried out in his country to provide a base for improvement of noise regulations for cars and commercial vehicles. The analysis of driving behaviour data of ten passenger cars and one offroad vehicle in urban driving conditions considered sixteen different types of road conditions. The sample of commercial vehicles included at least thirty different trucks, five buses and one coach. The results which had first been presented during the previous session revealed that the present fullload acceleration noise test of Regulation No. 51 did not correspond to real traffic situation. The German expert suggested that there were prospects to define a new test, more realistic whilst still reproducible. He showed the frequency distribution of speed, acceleration, engine power and gear usage for different street types and for different kinds of vehicles. He indicated that this analysis should allow to establish realistic operational modes for a new noise test method which would be submitted to the Meeting of Experts for consideration.  r5031.aavThe discussion of the research work carried out on vehicle noise led to the conclusion that a modified test might allow noise limit reductions which would be perceived in real traffic conditions, contrary to the present worst case test used in Regulation No. 51. It was recalled that this type of test had caused only limited impact on the real traffic noise attenuation even though the noise limits had drastically been reduced during the last twentyfive years.  r5 032.aavThe Meeting of Experts agreed to resume the consideration of this item at its next session. PREPARATION OF THE 1997 REGIONAL CONFERENCE ON TRANSPORT AND THE ENVIRONMENT  r5%0(a)aavConstruction requirements on vehicles in international traffic  r5'0Documentation: TRANS/WP.29/R.748/Rev.1TRANS/SC.1/WP.1/R.137/Rev.1; informal document No. 2 of the annex to this report. "(|,))-,"Ԍ r5033.aavThe secretariat introduced informal document No. 2 concerning a proposal to amend the 1971 European Agreement supplementing the 1968 Vienna Convention. The aim of the proposal, which had been considered at the last session of the Preparatory Committee of the Regional Conference on Transport and the Environment, was to ensure that commercial vehicles in international traffic comply with harmonized technical requirements regarding their environmental performance. The proposal was noted and the Meeting of Experts agreed to review at its next session its development into a final document for the Conference.  r50(b)aavPeriodic inspections of vehicles in international operations  r5` 0Documentation: TRANS/WP.29/R.764/Rev.1TRANS/SC.1/WP.1/R.138/Rev.1; informal documents Nos. 3 and 4 of the annex to this report.  r5 034.aavThe secretariat introduced informal document No. 3 concerning the proposal for an "Agreement Concerning the Adoption of Uniform Conditions for Periodical Technical Inspections of Wheeled Vehicles". The document which had been considered at the thirteenth session of the Preparatory Committee of the Regional Conference on Transport and the Environment contained the administrative part of the Agreement, having the structure parallel to the 1958 Agreement. Related informal document No. 4 contained provisions concerning the rules for periodical technical inspections of vehicles with regard to the protection of the environment. It was explained that future rules might comprise the safety aspects. The Meeting of Experts agreed to resume the consideration of this item at its next session in order to register its further  r5P0development for the Conference.;;4Y DEFINITION OF TESTING PROVISIONS IN NOISE REGULATIONS  r580Documentation: TRANS/WP.29/GRB/R.125/Rev.2.  r5035.aavThe expert from the Czech Republic introduced his proposal which had been prepared with the aim of harmonizing the requirements on measuring instruments, testing conditions and interpretation of results in all Regulations referring to noise of vehicles.  r5036.aavThe Meeting of Experts agreed in principal with the proposal, although the section related to the interpretation of test results was found difficult to harmonize at the present time. In this relation, it was pointed out that the proposal prescribed that the highest sound level should constitute the test result while the draft EU Directive on two and threewheeled vehicles (to which the corresponding ECE Regulations needed to be aligned) required to take the average value (see paras. 1624 above).  r5#037.aavThe Meeting of Experts agreed to resume consideration of this item at its next session awaiting the final decision concerning the two and threewheeled vehicle noise EU Directive. "'|,)),," EXCHANGE OF INFORMATION ON NATIONAL AND INTERNATIONAL REQUIREMENTSONNOISELEVEL  r5X0Documentation: Informal document No. 6 of the annex to this report.  r5038.aavThe expert from Japan distributed informal document No. 6 and informed the Meeting of Experts that his Ministry of Transport had decided to revise the national legislation in order to reduce noise from motor vehicles. As from October 1998 noise limits would be more stringent for new vehicle models and a modified test method would be implemented. OTHER BUSINESS  r5 0(a)aavTraffic noise modelling  r5 0Documentation: Informal document No. 12 of the annex to this report.  r5039.aavThe expert from the United States of America presented a computer simulation regarding the application of a traffic noise model, which had been developed by the University of Central Florida. He also explained that the model had recently been further improved (Version 4.2) by adopting new traffic algorithms which allow a better simulation of the passby traffic noise. A contact address for further information regarding this model was distributed (Dr. Roger Wayson, Department of Civil & Environmental Engineering, University of Central Florida, P.O. Box 162450, Orlando FL32816-2450, Fax: (+1407) 8233315). AGENDA FOR THE NEXT SESSION  r58040.aavThe following agenda was agreed for the twentyseventh session  r50(Geneva,4and 5 September 1997) 1/:  r501.6aavTyreroad noise 2/#a  r5 0aav1.1. Amendments to Regulation No. 30 (Pneumatic tyres)#  r50aav1.2. Amendments to Regulation No. 54 (Pneumatic tyres forcommercialvehicles)# __________  r5!01/6aavAs part of the secretariat's efforts to reduce expenditure, all the official documents distributed prior to the session by mail will not be available in the conference room for distribution to session participants. Delegates are kindly requested to bring their copies of documents to the meeting.#a  r5H&02/6aavThe session will follow the fortysecond session of the Meeting of Experts on Brakes and Running Gear (13 September 1997) in order to facilitate the participation of the experts from the tyre industry in the consideration of this agenda item.#a"(|,))-,"Ԍ  r502.6aavAmendments to Regulations related to twoand threewheeled vehicles:#a  r5X06aav2.1.z Regulation No. 9 (Noise of threewheeled vehicles)#  r506aav2.2.z Regulation No. 63 (Noise of mopeds)#  r5x06aav2.3.z Regulation No. 92 (Replacement silencing systems for motorcycles)#  r503.6aavAmendments to Regulation No. 51 (Noise of M and N categories ofvehicles)#a  r504.6aavPreparation of the 1997 Regional Conference#a aavon Transport and the Environment  r5 0aav4.1 Construction requirements on vehicles in international traffic#  r5 0aav4.2. Technical requirements on vehicles in use (periodic inspections ofvehicles in international transport)#  r505.6aavDefinition of testing provisions in noise Regulations#a  r5h06.6aavExchange of information on national and international requirements on  r500noise levels 3/#a  r507.aavOther business  r5P0aav7.1. Traffic noise modelling +__________ ___________  r5X03/6aavDelegations are invited to submit brief statements on the latest status in national requirements (if applicable) and, if necessary, to supplement this information orally.#a " |,))@!,"  r50GVaav { { ;;4YCCTRANS/WP.29/GRB/24 aav { { ;;4YCCpage  aav { { ;;4YCCAnnex G5VTRANS/WP.29/GRB/24 page  Annex5:Annexă  r50LIST OF INFORMAL DOCUMENTS DISTRIBUTED WITHOUT A SYMBOL DURING THE SESSION +a { ;CK!+ { ;CK!++No. Transmitted Agenda Language Title  r50   by   item       "R   r5@0 "R + { ;CK!, Lh p"$ 'x)+(.0205798<>@+, Lh p"$ 'x)+(.0205798<>@, Lh p"$ 'x)+(.0205798<>@ 1.rRussian_ _ 3.E/R1Proposal for a draft corrigendum to  r50rFederation_ _  1Regulation No. 51#  r50 2.rPreparatory_ _ 4.1.E 1Proposal for draft amendments to#  r5` 0rCommittee of_ _ 1the 1971 European Agreement#  r5( 0rthe Regional_ _ 1supplementing the 1968 Vienna  r5 0rConference on_ _ 1Convention (Redistribution of  r5 0rTransport and_ _ 1informal document No. 105 to the  r5 0rthe Environment 113th session of the Preparatory Committee)#  r50 3.rPreparatory_ _ 4.2.E1Draft proposal for an Agreement  r50rCommittee of_ _ 1concerning the adoption of uniform  r50rthe Regional_ _ 1conditions for periodical technical  r5h0rConference on_ _ 1inspections of wheeled vehicles  r500rTransport and_ _ 1(Redistribution of informal document  r50rthe Environment 1No. 106 to the 13th session of the Preparatory Committee)#  r5P0 4.rPreparatory_ _ 4.2E1Agreement concerning the adoption  r50rCommittee of_ _ 1of uniform conditions for the  r50rthe Regional_ _ 1periodical technical inspections of  r50 rConference on_ _ 1wheeled vehicles; Draft Addendum 1  r5p0rTransport and_ _ 1Rule No. 1 (Redistribution of  r580rthe Environment_ _  1informal document No.. 107 to the 13thsession of the Preparatory Committee)#  r50 5.rJapan_ _ 3.E1An investigation into urban driving r_ _ 1modes in Japan  r50 6.rJapan_ _ 6.E 1Notification to the WTO concerning Partial Revision of the Safety Regulations for Road Vehicles Act Regarding Motor Vehicle Noise#  r5 0 7. OICA_ _ 1.1.,E1Draft amendment proposals to ECE  r5 0r_ _ 1.2. 1Regulations Nos. 30 and 54 to insert provisions regarding tyre/road noise  r5`"0limitation OICA comments on documents ##:######TRANS/WP.29/GRB/R.140 and TRANS/WP.29/GRB/R.141#  r5%0 8.rUnited _ _ 1.1.,E1Assessment of the proposed European  r5H&0rKingdom_ _ 1.2. 1tyre noise type approval method (TRL Project Report PR/SE/228/96)# "( |,))-," No. Transmitted Agenda Language Title  r50   by   item      , Lh p"$ 'x)+(.0205798<>@, Lh p"$ 'x)+(.0205798<>@  r5 0 9.rRussian_ _ 1.1.,E?Proposal for an additional draft  r50rFederation_ _ 1.2.?amendment to Regulations Nos. 30 and 54, in relation to provisions limiting the noise generated by rolling tyres (doc.# r_ _ ?TRANS/WP.29/GRB/R.140 and r_ _ ?TRANS/WP.29/GRB/R.141)  r5010.rISO_ _ 3.E?ISO 362 1997 Modification (Presentation to United Nations Experts on Noise (GRB)#  r5 011.rISO_ _ 3.E?ISO/DIS 362: Acoustics Measurement of noise emitted by accelerating road vehicles Engineering method#  r5012.rOICA_ _ 7.E?AAMA CNM Version 4.0 (Roger L. Wayson, John MacDonald, Ron Eaglin University of Central Florida)#  r50013.rOICA_ _ 3.E?Light vehicle exterior noise: An urban drive cycle compared with existing passby test methods (SAE Cooperative Research Program)# +__________