CELEX: 51975PC0634
Language: en
Date: 1975-12-12
Title: Proposal for a COUNCIL DIRECTIVE on the approximation of the laws of the Member States relating to the permissible sound level and to the exhaust system of motor cycles (submitted to the Council by the Commission)

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COM (75) 634
Vol. 1975/0238
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 ---pagebreak--- COMMISSION OF THE EUROPEAN COMMUNITIES
                                        COM(75)634 final
                                        Brussels , 12 December 1975
                             Proposal for a
                            COUNCIL DIRECTIVE
                   on the approximation of the laws of
                   the Member States relating to the
                   permissible sound level and to the
                   exhaust system of motor cycles
               ( submitted to the Council by the Commission )
  00-1(75 ) 634 final
 ---pagebreak---                                        EXPLANATORY MEfElAITDUM
1 » General
    This proposal for a Directive comes within the scope of the Community-level
    type-approval procedure for motor cycles which was the subject of the proposal
    for a Directive submitted by the Commission to the Council on 24 July 1974 ( l )»
    This proposal concerns the approximation of the laws of the Member States rela­
    ting to the permissible sound level and the exhaust systems of motor cycles#
    In a letter of 31 January 1974 * "the French Government notified the Commission ,
    pursuant to the agreement of 28 May 19&9 concerning the status quo and keeping
    the Commission informed , of its intention to amend French legislation in this
    resnrd , Hot/ever , the Government has agreed to postpone putting its draft into
    force until tho Council has adopted a Directive ,
    Other Member States' too have legislation , either at the draft stage or in
    force , concerning these aspects of motor cycles . Being aware of the differences
    between the prescribed sound emission levels which are likely to create barriers
    to trade , the Commission is proposing, pursuant to Article 100 of the Treaty ,
    Community-lovel provisions aimed at harmonizing the national provisions in
    force which affect the establishment and the functioning of the common market .
    Furthermore , the declaration of the Council of the European Communities and of
    the representatives of the governments of the Member States meeting in the
    Council on 22 Uovember 1973 on the subject of the environment programme , pro­
    vides for a reduction of the sound emissions of motorcycles . Motor cycles
    represent a by no means negligible proportion of the motor vehicles on the
    roads in urban centres . Moreover , this type of vehicle is tending to increase
    in number . Furthermore , in vietv of their technical characteristics , these
    vehicles are frequently used at full throttle , i.e. : at very hi$i engine speeds .
    It has been proved that with most motor cycles a. 20 cJo increase in speed causes
    at least a doubling of the sound intensity1 emitted ,           j.--
    It follovrs that motor cycles constitute a very important source of nuisance ,
    if not the most annoying, among the land vehicles , and particularly since the
    application of Council Directive 70/157/EEC of 6 February 1970 led to an appre­
    ciable reduction in the noise pollution caused by four-wheeled motor vehicles#
     ( l ) C0M( 74)1175 final of 24 July 1974
 ---pagebreak---    2 , Comments on the proposal for a Directive
        xhe scope is limited to two or three-wheeled motor cycles whose
       maximum design speed is greater than 45 kn/h ,     In the case of a
       three-wheeled vehicle      moreover , the empty weight shall not e::ceed
       400 kg, ....
       Article 2 integrates into .the EEC typei-approval procedure the provi­
        sions relating to the permissible sound level and to the esdiaust
        system of such motor cycles .
       Since certain Ilember States do not at present have a type-approval
       procedure of their own , it is necessary to lay dovm provisions
       ensuripg that vehicles conforming to the requirements of the Dircc-'ive
        (Article 3 ) (l ) in these States are allowed to be used*
       Where the prototype is niodified , the Ileraber State which carried out
       the type approval must be in a position to assess whether it is
       appropriate to' perform fresh tests (Article 4 ).
       Article 5 lays down the procedure for adapting the provisions of
       the annexes to technical progress , this     procedure being set out in
       Article 13 of the Council     Directive of                       on the
         type-approval 'of motorcycles. ( 2 )       .                         ■  •
       Article '6 provides for two deadlines . Before the first deadline , V
       the Ilember States must adopt and publish the measures necessary to
       comply' with the Directive ,   The second deadline determines the date
       on which all the Ilember States must simultaneously put the coram on
       rules into force ( article 6 (l )),
(l)-OJ h 73 of 27.31^2 "Documents concerning the accession to the European
      Communities of the Kingdom of Denmark , Ireland , the Kingdom of Uorway -;
      and the United Kingdom of Great Britain and Northern Ireland",
      Act concerning the conditions of accession and the adjustments to the
      treaties – Annex I , title X,
 (2 ) 0011(74)1175 final of 24,7.1974.                ...         . ;
 ---pagebreak---  Finally , the Commission must "be informed within a reasonable time of all
 draft provisions drawn up by the Member States in the field referred to by
 the Directive , the purpose of this information being to enable the Ccnanission
 whatever comments it may have to make on these drafts (Article 6 ( 2) ).
 The technical annexes contain the requisite definitions , the procedure for
 application for EEC typo-approval , the limits to be observed as regards the
 sound level during the testing of motorcycles in motion and the requirements
 concerning measuring instruments , conditions and methods .     -
 A wide measure of agreement was achieved between the experts from the Member
 States who assisted the competent departments of the Commission in matters
 concerning the test requirements when this Directive was being drawn up .
 These requirements state that each type of motorcycle must be subjected to
<5, test while in motion and a test when stationary to be able to obtain
 EEC type-approval in respect of its sound level .    However , only the results
 of the test in motion are to be compared with the permissible limits and will
"be determinating as regards the type-approval or rejection of the vehicle .
The results of " stationary" test will only be recorded and should serve as
 a reference for the competent authorities when inspecting vehicles on the road
 The method for measuring the sound level of motorcycles in motion is based
 cn the principle that , bearing in mind their normal conditions of use in
 urban traffic , the speed of the engine is the main criterion for the noise
 provoked .  In consequence , this method was specified in such a way as to
 ensure that motorcycles of every category reached at least three-quarters
 of their maximum engine speed towards the end of the acceleration period, a
 condition in which the engine at full load generally develops its maximum
 sound level .  This means that , on the test site specified in the Directive ,
 motorcycles are , without exception , to be tested in the gea? ratio immediately
 above the starting ratio .   This condition , however , has proved to be very
 difficult to apply in the case of certain current types of motorcycle with a
 cylinder capacity below 350 cm^ and equipped with gear boxes having more
 than four ratios .  To enable the manufacturers of such motorcycles to adapt
 their products to the provisions of this Directive within an appropriate
 time–limit , a transitional period of two years is scheduled, -during- which_.
 ---pagebreak---                                             - 4 -
     the "in motion" test for the motorcycles in question is to "be carried out
     in third gear,.. i;   .                                                     ■ -
     With regard to . the limit - values for the sound level of the various categories
     of motorcycle ,, the Commission 's proposal met with the proposal of only some
     of the national experts ;     it nonetheless represents a happy median "between
     jthe extrem . positions adopted by certain experts .
3 . Consultation with the European Parliament and the Economic and Social Committee
  ,. In compliance with the provisions of. the second paragraph of Article 100 ,
     it is necessary to obtain the opinions of these two bodies .
 ---pagebreak---                                - 5 -
THE COUNCIL OP THE EUROPEAN COMMUNITIES ,
Having regard to the Treaty establishing the European Economic
Community , and in particular Article 100 thereof ;
Having regard to the proposal from the Commission ;
Having regard to the Opinion of the European Parliament ;
Having regard to the Opinion of the Economic and Social Committee ;
Whereas the technical requirements which motorcycles must satisfy
in accordance with national laws relate , inter alia ,; to the
permissible sound level and to the exheust system ;
Whereas these requirements differ from one Member State to
another ; whereas it is therefore necessary that all the Member
States adopt the same requirements , either in addition to or in
place of their existing rules , in order to allow the EEC type-
approval procedure which was the subject of Council Directive
No               of                           on the approximation of the
laws of the Member States relating to the type-approval of motor­
cycles to be applied in respect of each type of vehicle ;
Whereas the increased numbers and use of motorcycles aggravates
the . annoyance caused by noise pollution , and whereas therefore "
the noise emissions of motorcycles should be limited on the basis
of a representative method of testing ;
Whereas the approximation of national laws relating to motorcycles
entails the reciprocal recognition by Member States of the tests
carried out by each of them on the basis of common requirements ;
whereas in order to work properly such a system , involves the
application of these requirements by all Member States with effect
from the same date , .
               s
                     »                         ' 4 ' '   :'» "
HAS. ADOPTED THIS DIRECTIVE :       .- =    .          -       .--.i   nx
( 1 ) C0M(74 ) 2177 final of 20 . XII . 1974 .
 ---pagebreak---                                Article 1
 For the purposes of this Directive , "motorcycle"' means any
 vehicle having two or three wheels , with a maximum design speed
 exceeding 45 km/h ." In the case of a vehicle having three wheels ,
 additionally the unladen weight shall -not exceed 400 kilogrammes .
                               Article 2
 No Member State may refuse to grant EEC type-approval or national
 type-approval of a motorcycle on grounds relating . to the
 permissible sound level or the exhaust system of its sound level
 and exhaust system satisfy the requirements set out in Annex I.
                               Article 3
 No Member State may refuse the registration or may prohibit the
 sale , entry into service or use' of any motorcycle on grounds
"relating to " the permissible sound level or the exhaust sytem if
 its sound level and exhaust system satisfy the requirements set
 out in Annex I.                         '
                               Article 4
 The Member State which has granted type-approval shall take the
 necessary measures to ensure that it is informed of any modification
 of a part or characteristic referred to in item 1,1,' of Annex I.
 The competent authorities of that State shall determine whether
 fresh tests should be carried out on the modified vehicle type and
 a fresh report drawn up . Where such tests reveal a failure to
 comply with the requirements of " this Directive , the modification
 shall not be approved .
                               Article 5
 The amendments necessary to adapt the' provisions of Annex I , II and
 III to take account of technical progress shall be adopted . in
 accordaiidei with thS procedure laid down in Article . 13 of Council
 Directive No             of                     on the type-approval
 of motorcycles .                             •
 ---pagebreak---                               Article 6
1 , Member States shall adopt and publish by 1 October J.977 the
provisions necessary to comply with this Directive and shall,
forthwith inform the Commission thereof , Uhey shall implement
these provisions with effect from 1 October 1978 ,
2 . After notification of this Directive , Member States shall take
steps to inform the Commission , in sufficient time for it to make
comments , of any draft laws , regulations or administrative
provisions which they intend to adopt in the field covered by
this Directive .
                              Article 7
This Directive is addressed to the Member States i
 ---pagebreak---                                     ArîIIEX I
DBHIO-TIOITS , APPLICATIONS FOR EEC TYPEWIPPROVAL , EEC TIFE-JIPPROVAL , FER-
                         IHSSIBLE SOOHD LEVELS . EXHAUST SYSTSti
1*       ICTTKETIOFS
         For the purposes of this Directive :
1«1»'    "Type of motorcycle as regards its sound, level and exhaust system"
         means motorcycles which do not differ in such essential respects as *
1 #1»1 » type of engine ( two?- or four-stroke , number and volume of cylinders ,
                                                                           a >
         numbgr of carburettors , arrangement of valves , maximum power speed ,
         etc,); .
l*l»2«   transmission system , in particular the number of gear ratios ;
         number , type and arrangement of exhaust systems ;
1.2#     "Exhaust system" means a complete set of components necessary to
         limit the noise caused by a motorcycle and by its exhaust j
1»3«     "Exhaust systems of different types " means systems which do not
         differ in such essential respects as j
1«3»1 »  systems whose components bear different factory or trade marks ;
1.3.2 *  systems im which the characteristics of the materials forming
         any component are different or whose components are of a different
         shape or size ;
1,3«3 *  systems in which the operating principles of at least one component
         are different ;
1»3*4»   systems whose components are in different combinations ;
                                                         •••/ • ••
 ---pagebreak---                                                                   Annex I
 1.4 .         "Component (*) of an exhaust system" means one of the individual
               components which together form the exhaust system ( exhaust pipes
               and tubes , the silencer itself , etc#)#
                                                       **  •»   *
 2.     ... ~ APPLICATION FOR EEC TYPE-APPROVAL     .   ..
 2.1#         The application for EEC type-approval of A motorcycle type with
              regard to its sound level and the exhaust system shall be presen­
              ted by the manufacturer or his agent .
 2.2 .        It shall be accompanied by the undermentioned documents in
              triplicate and the following information :
 2.2.1#       a detailed description of the type of motorcycle with regard to
              the criteria mentioned in item 1.1 . above. The number and/or
              symbols that characterize the engine and vehicle type must be
              shown ;  .
 2#2.2.       a list of the components , duly identified , which form the exhaust
              system ;
'2.2.3#       a sketch of the system as-a whole and an indication of its
              position on the motorcycle ;
 2 . 2*4#     detailed sketches relating to each component so that it may be
              easily located and identified together with information on the
              materials of which it is made.
 2.3 »        A vehicle which is representative of the motorcycle type to be
              type-approved must be presented to the technical department
              responsible for the type-approval tests.               1
 2.4#         At the request of that department , the manufacturer shall in
            • addition present a specimen of the exhaust System#
                                          Α
 3#           EEC TYPE-APPROVAL
 3#1#         A form conforming to the model in Annex III shall be attached to
              the EEC type-approval certificate .
 (*) If the engine is equipped with an air filter which is indispensable
       lor the purpose of complying with sound-level limit values , it shall
       be considered as a component of the exhaust system#
 ---pagebreak--- 1
i                                      -
                                               «. 3 -
                                               M      f
  if .            PERMISSIBLE SOUND LEVELS
  4,1„»           Limits
                  The sound level of the motorcycles referredto in Article " 1 of
                  this Directive , when measured under the conditions set out in
                 points 4*2* to 4»4« of thi's Annex , may not exceed the following-
                 levels :
                ( Category of Cubic Capacity                     Permissible Sound Level
                !             r ( cm )                                      ■ dB ( A ) \       •#           •
                ι     :    Γ­                               W ll»ll   ■ I  1  1
                Ι"           4      50                        '     *           80
                             c:    125 *'                                       82
                ! - :        .4 550                                             84 . ,
                                                                                         « '   ι··· ■*"(·'♦
                !             è 500 . .                    j             '      °5 ,=
                !             > 500                        !                    86
                     three-wheeled vehicles                                     85 • •       »        ·Κ
                ι        _                       .. ·■·.'!
                 Measuring instruments ( noise of motorcycles in "motion )
  4.2.1-» ,       Acoustic measurements                                                ' 1      .. .»■
  4.2.1.1 * The apparatus used for measuring the noise level must be a
                  precision instrument of the type described in Publication - 379
                  "Precision sound-level meters ", 2nd edition * of the Interna­
                  tional Electrotechnical Commission ( ISC ). Measurements shall
          !       be carried out using the "fast " display speed and the "A""1
              . weighting Curve .      • ■ " '
  4.2.1 , 2-»     At the beginning and end of each series of measurements the
              . sound-level meter shall be calibrated according to the mjin.u-
                  facturer , s instructions with a suitable acoustic source
                  ( e.g. pistophone ) . .
  4.2 . 1«3 *    Speed measurements
                 Engine speed , motorcycle speed and acceleration distance shall
                  be determined to within +
 ---pagebreak---                                        - k -
             Conditions of measurement ( noise of motorcycles in motion )'
^• 3*1 «     Condition of motorcycle
4-.3.1 »1 •  During the measurements the weight of the motorcycle with
             driver must comply with point 2 , km of the Model Information:
             Document ( Council Directive of                          ( 1 ).
             Before the measurements are made , the vehicle engine must be
             brought to normal operating temperature . The automatic .
             actuating mechanism of fans which are switched on and off
             automatically shall^ not be interfered with during the noise
             measurements . For vehicles having more than one driven wheel ,
             only the drive provided for normal road operation shall be
             used . Where a motorcycle is fitted with a side-car , the side­
             car , shall be removed for the purppses of the test . .         *
^. 3.2 .     Test-site
k . 3.2.1 .  The test-site must consist of a central acceleration section
             surrounded by a substantially flat test-site . The acceleration
             section must be flat ; its surface must be dry« and such that
             rolling noise remains low .-             "
             On the test-site the variations in the free sound field between
             the sound source at the centre of the acceleration seetion and
             the microphone must not exceed + dB . This condition is deemed
             to be met if there are no large objects which reflect ^ ound ,
             such as fences , rocks , bridges or buildings , within 50 m of
             the centre of the acceleration section . The surface of the
             track must be made of concrete , asphalt of the hot rolled type
             or any other acoustically equivalent material within a band
             10 m wide on both sides of the centre of the acceleration
             section and be free of powdery snow , tall grass r loose soil
             or ashes .-
( 1 ) comC?^) 2177 .
                                                                          •/•
 ---pagebreak---                                               - 5 -
                    The microphone shall not be obstructed in any way which could
                    affect the sound field , and no persons should stand between
                v.*:the- microphone- and- the sound source ♦ The ob&erV-er-earrying *
                    out the measurement must position himself so that he does not
                    affect the reading of the measuring instrument#
k »3>«2.2 , Measurements may not be car ied out in bad (weather » Wind
                    effects must be excluded .,                    , ■
                    In type testing measurements , the A-weighted sound level of
                    noise sources, other than the motorcycle to be tested or of
                    wind effects must be-at least of 10 dB(A ) below th6 sound
                    level produced by the motorcycle . A suitable wind shield may
 ,{           - , be fitted to the microphone provided that acoount is taken of
                    its effect on the "sensitivity of the microphone .      •-
******              Method of Measurement ( noise of motorcycle in motion)
4.^.1 ,             Measurement of noise of motorcycle in motion        ..           ...
4 . '+♦,1.1 , The microphone shall be located 7*5 m from the line of refe­
                    rence CC' ( Fig * 1 ) of the track , 1.2 m abo;ve the level of the
         (          track . The motorcycle shall be driven over the acceleration
                    section in such a way that the projection of the longitudinal
                    median plane of the vehicle is as close as possible to line CC **.
^./f.1.2 «, At least two measurements shall be made on both sides <yf the
                  . vehicle *
k .{t-.>1,»3 » / The maximum -sound level indicated in decibels ( dB)" and
      i -           evaluated by- means of the "A" weighting curve shall be measured
            <      .as *the motorcycle- is driven between lines AA' and BB' (Fig . 1 ).
           -•    • The. measurement is invalid if there is found to be an abnormal
              ■ , discrepancy between the peak Value and the general sound level ..
 ---pagebreak---                                         - 6 -
4.4.2 .         Operation of the motorcycle
^ . 4.2.1 . The motorcycle shall approach line AA T at a steady speed as
                specified in 4.4.2.2 . to 4.4.2.4 . When the front end of the
                                                «
                vehicle reaches the line AA' , the throttle shall be opened as
                quickly as possible to the fully opened position .    This posi­
                tion shall be maintained until the rear end of the vehicle
                reaches line BB 1 ; the throttle shall then be released as
                quickly as possible and allowed to return to the idle position .
                                                                        Ψ 4   ■■
4.4.2.2 .       The motorcycle shall approach line AA' , at an initial steady
                speed :
4<4«2»2.1 . of 50 km/h , the speed of rotation of the engine being between
                 50 and 75 % of the speed at which the engine develops it$
                 maximum power , or
^.4 . 2.2.2 . less than 50 krn/h , the sp'eed of rotation of the engine being
                 equal to 75 . % of the speed at which the engine develops its
                 maximum power , or
4 .4.2,2 »3« more than 50 km/h , the speed of rotation of the engine being
                 equal to 50 % of the speed at which the engine develops its
                 maximufi power .                                                .■ v
4.4 . 2.5 . The . test shall be carried out in the gear ratio immediately,.
                above the starting ratio .. However , until . 1st October 1980
                motorcycles having a cubic capacity of not more than 350 cm^
              ' shall be tested in third gear if their gear-box has more than
                four ratios .
4.4..2.4 . For motorcycles without transmission controls the initial
                steady speed shall be :
  • '+    ♦ 1 • 50 km/h , the speed of rotation of the engine being between
                 50 and 75 per cent of the speed at which the engine develops
                 its maximum power r or                             .
4.^.2.4.2 . less than 50 km/h , the speed of rotation of the engine being
                 equal to 75 % of the speed at which the engine develops its
                 maximum power ..
                                                                            /
 ---pagebreak---                                             + 7 -
                  Results
                  All conditions and influences affecting the measurements shall
                  be indicated in the test " record in accordance with the Annex II .
   4.4.3. 2 «     Reading from the measuring instrument shall be taken 'to the
                  nearest half-decibel , ""
, -               Only those measurements may be used for type approval whose
                  difference in . two consecutive tests on the same side of the
                  motorcycle is less than or equalHo 2 dB .
  4*^»3»3* To take account of inaccuracies in the instruments , the result
       - - ■      of each measurement shall be arrived at by deducting 4 dB- * "
                  from the meter reading .                                  •
  V*4«3 »^«       The highest value recorded shall constitute the tes-fc >'eeulW .
               ; Should that: value exceed by not more than 1 dB the permissible
                  sound level for the class of motorcycle tested ,- two further
                  measurements may be made *                                      t. .
             " The limits laid down in 4.1 • shall be regarded "as being complied
                  with if three of the four measurements do not exceed the per­
                 missible level ."                                        - , . -               •
  4.5 *          Measurement of noise of stationary mo~torcycle '
                 Sound pressure level in the immediate vicinity of motorcycles .
                 For motorcycle as defined in Article 1 of t^e present Directive
                  the sound pressure level shall be measured in the immediate
                 vicinity of the exhaust system outlet ( silencer ) in accordance
                 with the following provisions , the result of the measurement
                 being entered in the test record as laid down in Annex XI.'
                 Sound measuring instrument .
                 A precision sound-level measuring instrument as defined in
                 ^* 2.1.1 . and 4.2.1,2 . 6hall be used'.
              : • •   • :                 ' .  ..    -  ... < . • •       -         ..    ... , ■
                                 '  . ... _ :r ' ... ..             ; . ;     ■■■  <   -.
 ---pagebreak---              Condition of the motorcycle
             During the measurements the weight of the vehicle must comply
             with   point 2,V«    of the Information Document ( Council Direc­
             tive              of                ( 1 ))» Before the measure­
             ments are taken the vehicle engine shall be brought to the
             normal operating temperature . In the case of fans which are
             switched on and off automatically , the automatic actuating
             mechanism shall not be interfered: with during the test *
             During the measurements the machine shall be in neutral gear .
             If it is impossible to disconnect the transmission , the driving
             wheel of the motorcycle must be allowed to rotate freely , for
             example by placing the vehicle on its centre stand#
             Test track
             Any area xn which there is no significant acoustic disturbances
             may be used as a test track . Especially suitable are flat
           ■ surfaces which are covered with concrete , asphalt or some other
             hard material and are highly" reflective ; surfaces consisting
             of earth which has been tamped down must not be used . The
             test track shall be in the form of a rectangle the sides of
             which are at least 3 m from the outer edge of the motorcycle .
             There may be no significant obstacles , e.g. persons other than
             the rider and the observer within this rectangle . The motor-
          I cycle shall b« positioned within the said rectangle so that
             the microphone used for measurement is at least 1 m from any
     ' - . kerbstones which may be present . .
          • Readings of the measuring instrument due to. background noises
             and wind effects must be at least 10 dB(A ) lower than the
             silencer levels to be measured .  A suitable wind shield may
             be fitted to the microphone , provided that account is taken
             of its effect on the sensitivity of the microphone .
( t) C0M(7*t)2177 of 20.12,197 **
                                                                    •/ •
 ---pagebreak---   Method of measurement
  Number of measurements ' ; ' ' • -     •                      *
  At least three measurements shall be made at each point *
. Only those values shall be - used which - have been obtained in
  three consecutive measurements and which vary by not more than
  2 dB(A) ».*   -
  Test resuit
  The highest of the three measurements shall constitute the
  test result .
  Position of microphone ..{ Fig .- 2 ) . ,
  The microphone shall be located level with the exhaust outlet
  but shall under no circumstances be less than 0.2 m above the
  surface of the track .   The microphone diaphragm must face
  towards the exhaust outlet and be located at a distance of
  0.5 m from it .   The axis of th.e main sensitive area of the
  microphone must be parallel to the surface of the track at sin
  angle of ^5°. + .10°    the vertical plane of the- direction of
  the exhaust emissions . ; - ... ; .
  In relation to this vertical plane , the microphone shall be
 positioned on the external side of the vehicle contour at the
  side which gives a maximum distance between the microphone
  and the vehicle contour .
 If the exhaust system has more than one outlet with a centre-
  to-centre' distance' between : them of less than 0.3 m » the micro­
 phone shall be faoed towards' the' outlet which iB nearest the
  vehicle which is higher above the surface of the track .      If
  the centres of the outlets are more than 0.3 m apart , separate
 measurements shall be made for each of them , the highest fi»
  gure " recorded being taken as the test value .      '
 ---pagebreak---                            - 10 «
Engine operating conditions
The engine speed shall be held constant at one of the following
values S                 "                             , , '.
  S
- –    if S exceeds 5 . 000 rev/min ,
-¥       if S does not exceed 5*000 rev/min .
when S is the speed of rotation at- which the "engine d'evelops its
maximum power .  - ;                                          ,
When constant engine speed is reached , the throttle shall
suddenly be returned to the idle position . The sound level
shall be measured throughout the duration of deceleration
the maximum deflection of the needle , rounded off to the nearest
decibel , being taken as the test value .
Test record
All details regarding the measurement of the noise emitted by-
stationary vehicles shall be entered in the test record as
laid down in Annex II .
EXHAUST SYSTEM ( SILENCER )
If the vehicle is fitted with a device designed to reduce the
exhaust noise ( silencer ), the requirements of item 2 shall apply .
If the inlet of the engine is fitted with an air filter which
is necessary in order to ensure compliance with the permissible
sound level , the filter shall be considered-rto be part of the
silencer , and the requirements of item 2 shall also apply to that
filter .
A drawing of the exhaust system shall be annexed tp the vehicle
type- approval certificate .
The silencer must be marked with a reference to its make and
type which is clearly legible and indelible .
 ---pagebreak---                         - 11 -
The use of fibrous ; absorbent material is permitted'~in the
construction of silencers only if the following conditions
are fulfilled :       ,                                  *
The fibrous absorbent Material- may not be placed in thps §
part § of the silencer through which the gases pass .
Suitable devices must ensure that the fibrous absorbent mate­
rial is kept in place' for the whole " time that the silencer
is being used .
The fibrous absorbent material must be resistent to a tempera­
              *
ture at least 20 % higher than the operating temperature which
may occur in the region of the silencer where these fibrous
absorbent materials are situated .                   .     1 ■
 ---pagebreak---                                     - 12 -
                FIG, 1 t    MEASURING POSITIONS FOR MOTORCYCLE IN MOTION
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                PIG. 2 T MEASURING POSITION FOR STATIONARY MOTORCYCLES
                   I   1                            height of exhaust axle
                                                         U
                 e                                  r~–         •'    ..
   liL1iCL *T                             ^         T£
                                                                               1
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   v Q–T-                                                                       ,
                                         4^1''                       4vAi'.
 ---pagebreak---                                                                                          ANNEX II
                              Test record for Measuring Sound Level of Motorcycles
   Appendix to. certificate n° ,«                                                           of the technical department                                               of
  1.              Motorcycle - * .                                           ..                                                               Date of test t
  1.1 .           Manufacturer or authorized agent .
  1.2 .    . Type :
  1.3 .           Model î                                                                                                                     Carried out by :
  1.4 .           Fraûie N°               : .
2.                Engine j
2.1 »             Manufacturer î
2.2 .        ' Type '» • '                                     :-
2.3 . Model î                                                                                                                       ,   .      .   ?                     . --î
2.4 . - Output t                                                                                                                  hp/kW                         at rev/min
3.                Gears :                                 without gear                              manual gear                                automatic xx
                                                                   change                                change
4.                Fitted with x
4.1 .             Exhaust silencer :                                            Manufacturer :
                                                                                Model, :
                                                                         '"■-•Type : "               •»                  According to drawing N° :
4,2 . , Intake . si-Lencer _                                                    Manufacturer î
                                                                                Model :
                                      " ' 1 ■ ;- » > ■■-              ' --      Type -                     •          * According to drawing N° :
5.                Measuremerits - 1 ' * ' * " '                            *«■•*»»»»•«.
5.1 .           • Ncisc of«• motorcycle,                  v
                                                                      in motion. r-.:         „ , .t * c - -• »                              « * •   .■   t '
                                                             Measurement results
                                                   î–
                                                                                                                                Position of Gear
           *   V   <■
                                                       ' ' left " * ' '                   ' right " "                                         Change
             < "   8 » i * '  ' '4   .v • .«   .    • ■. dB ( A ) x . . , .               dB ( A ) * -
               –         ;   ;                   ]
   1 . Measurement ' ' I
   2Î - &ëàsurenôn&~-H                                                            i .,..                        • I * - * A U - -   v t • » ; «      * jp f. ~ v ».
   3 » Measurement                               !
   4 . Measurement'                          r I "          "4       4 '         -
   Test result t '''                                                                      dB ( A ) E
5.2 . JJoise of stationary motorcycle .:
I    I I I        il                                 I
                                                             dB ( À )"- *              , Test . englue . .                      -   Teste -'conditions xx
             # M           .       %                       »    .  *
                                                                                          speed min ""
   1 . Measurement                                                                                                                S
                                                                                                                           η  β   –                     ·     '·
                                                                                                                                  6   .  • . .
   2 . Measurement
   3 » Measurement                                                                                                         η = 3/4· 6-
   Measurement result g                                           dB ( A)                                                             *.«. ■»    <                  «
   k ) The values indicated are the measurements obtained minus 1dB(A)
xx ) Tick where appropriate
 ---pagebreak---                                                             ANMX III
                                                              MODEL
                                                                            ÏTane of Administration   "        !"
                                                                                                              -t          «
                               AMEX TO THE EEC-TYPE APPROVAL CERTIFICATE WITH REGARD, TO                           «   '%     -
                               PERMISSIBLE SOUHD LEVEL AND THE EXHAUST SYSTEM OP MOTORCYCLES ■ .
                                 (Article 4(2 ) and Article 10 of the Council Directive •••••<
                         of •••«•••             on the approximation of the laws of the Member
                                   States relating to the type approval of motorcycles ]
      1   Type-approva 1
          1*       Trade name or mark of the vehicle                                                                  *• -
          2 . . Vehicle type
          3*       Manufacturer 's name and address                                                                    ■.
                                                                                                        - _ _     »      )
          4* If applicable , name and address of manufacturer's authorised "
                   representative
          5.       Vehicle submitted for                type-approval on
          6,       Technical service responsible for type-epproval tests ••••••••.•••«•« ..
          7 ..     Date of report issued by that service
          8*       Number of report issued by that service                                       •••••■•<•• _
!         9* Type-Approval in respect of sound level and exhaust systep
        _10,       Place
         11 .      Date
.....    12 ,      Signature-                                                                                 "
         13 » The following documents , bearing the type-sppypval ^upbej?. shown, abOvG, v ,
                        are annexed t
                                        . * * system of the exhaust system                     ;
                    •                         the test record for measuring , sound level
                                                                                      •. • - -    - -      >■
               v" +4+"^ iiifi* -*irS>OW                      5« '-'ri/*'' '                               ! r   v             •
                                                                                                        «   . *      *     » UV-.