Regulation No. 9-06

Name:Regulation No. 9-06
Description:Noise - Three-wheel Vehicles.
Official Title:Uniform Provisions Concerning the Approval of: Category L2, L4 and L5 Vehicles with Regard to Noise.
Country:ECE - United Nations
Date of Issue:1974-03-26
Amendment Level:06 Series, Supplement 1
Number of Pages:34
Vehicle Types:Motorcycle
Subject Categories:Prior Versions
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Keywords:

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Text Extract:

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E/ECE/324 )
E/ECE/TRANS/505 ) Add.8/Rev.2/Amend.2
November 10, 2006
STATUS OF UNITED NATIONS REGULATION
ECE 9
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
CATEGORY L , L AND L VEHICLES WITH REGARD TO NOISE
Incorporating:
05 series of amendments
Date of Entry into Force: 26.01.94
06 series of amendments
Date of Entry into Force: 08.03.99
Corr. 1 to the 06 series of amendments
Dated: 06.08.99
Supplement 1 to the 06 series of amendments
Date of Entry into Force: 10.10.06

REGULATION No. 9
UNIFORM PROVISIONS CONCERNING THE APPROVAL
OF CATEGORY L , L AND L VEHICLES WITH REGARD TO NOISE
CONTENT
REGULATION
1. Scope
2. Definitions
3. Application for approval
4. Markings
5. Approval
6. Specifications
7. Modification and extension of approval of a vehicle type or a type of exhaust or silencing system
8. Conformity of production
9. Penalties for non-conformity of production
10. Production definitely discontinued
11. Transitional provisions
12. Name and addresses of technical services conducting approval tests, and of administrative
departments
ANNEXES
Annex 1 :
Communication concerning the approval or extension or refusal or withdrawal of approval
or production definitely discontinued of a vehicle type with regard to noise, pursuant to
Regulation No. 9
Annex 2 : Arrangements of approval marks
Annex 3 : Methods and instruments for measuring the noise made by motor vehicles
Annex 4 : Specifications for the test site

2.5. Exhaust or Silencing System Component means one of the individual constituent parts
whose assembly constitutes the exhaust or silencing system.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to noise shall be submitted by its
manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate and the following
particulars:
3.2.1. a description of the vehicle type with regard to the items mentioned in Paragraph 2.2
above. The numbers and/or symbols identifying the engine type and the vehicle type shall be
specified;
3.2.2. a list of the components, duly identified, constituting the exhaust or silencing system;
3.2.3. a drawing of the assembled exhaust or silencing system and an indication of its position on
the vehicle;
3.2.4. detailed drawings of each component to enable it to be easily located and identified, and a
specification of the materials used.
3.3. At the request of the technical service conducting approval tests, the vehicle manufacturer
shall, in addition, submit a sample of the exhaust or silencing system.
3.4. A vehicle representative of the vehicle type to be approved shall be submitted to the technical
service conducting approval tests.
4. MARKINGS
4.1. The components of the exhaust or silencing system shall bear an international approval mark
consisting of:
4.1.1. the "E" mark described in Paragraph 5.4.1.; and
4.1.2. the markings described in Paragraph 5.4.2.
4.2. Such markings shall be clearly legible and indelible.

6. SPECIFICATIONS
6.1. General Specifications
6.1.1. The vehicle, its engine and its exhaust or silencing system shall be so designed, constructed
and assembled as to enable the vehicle, in normal use, despite the vibration to which it may
be subjected, to comply with the provisions of this Regulation.
6.1.2. The exhaust or silencing system shall be so designed, constructed and assembled as to be
able to resist the corrosive action to which it is exposed.
6.2. Specifications Regarding Sound Levels
6.2.1. Methods of Measurement
6.2.1.1. The noise made by the vehicle type submitted for approval shall be measured by the two
methods described in Annex 3 to this Regulation for the vehicle in motion and for the vehicle
when stationary.
6.2.1.2. The two values measured in accordance with the provisions of Paragraph 6.2.1.1 above shall
be entered in the test report and on a form conforming to the model in Annex 1 to this
Regulation.
6.2.1.3. The sound level measured by the method described in Annex 3, Paragraph 3.1 to this
Regulation when the vehicle is in motion shall not exceed (for new vehicles and new exhaust
or silencing systems) 80 dB(A) for Categories L and L and 76 dB(A) for Category L ..
7. MODIFICATION AND EXTENSION OF APPROVAL OF A VEHICLE TYPE OR A TYPE OF
EXHAUST OR SILENCING SYSTEM
7.1. Every modification of the vehicle type or of the exhaust or silencing system shall be notified to
the administrative department which approved the vehicle type. The said department may
then either:
7.1.1. consider that the modifications made are unlikely to have an appreciable adverse effect; or
7.1.2. require a further test report from the technical testing service.
7.2. Confirmation or refusal of approval, specifying the alterations, shall be communicated to the
Parties to the Agreement applying this Regulation in accordance with the procedure specified
in Paragraph 5.3 above.
7.3. The competent authority issuing the extension of approval shall assign a series number for
such an extension and inform thereof the other Contracting Parties to the 1958 Agreement
applying this Regulation by means of a communication form conforming to the model in
Annex 1 to this Regulation.

11. TRANSITIONAL PROVISIONS
11.1. As from the official date of entry into force of the 06 series of amendments, no Contracting
Party applying this Regulation shall refuse to grant ECE approval under this Regulation as
amended by the 06 series of amendments.
11.2. As from the date of entry into force of the 06 series of amendments, Contracting Parties
applying this Regulation shall grant ECE approvals only if the vehicle type to be approved
meets the requirements of this Regulation as amended by the 06 series of amendments.
11.3. Contracting Parties applying this Regulation shall not refuse to grant extensions of approval in
accordance with the preceding series of amendments to this Regulation.
11.4. Contracting Parties applying this Regulation shall continue to grant approvals to those types
of vehicles which conform to the requirements of this Regulation as amended by the
preceding series of amendments until the entry into force of the 06 series of amendments.
11.5. ECE approvals granted under this Regulation before the entry into force of the 06 series of
amendments and all extensions of such approvals, including those granted subsequently
under a preceding series of amendments of this Regulation, shall remain valid
indefinitely. When the vehicle type approved under the preceding series of amendments
meets the requirements of this Regulation as amended by the 06 series of amendments, the
Contracting Party which granted the approval shall so notify the other Contracting Parties
applying this Regulation.
11.6. No Contracting Party applying this Regulation shall refuse national type approval of a vehicle
type approved to the 06 series of amendments to this Regulation or meeting the requirements
thereof.
11.7. As from June 17, 2003 Contracting Parties applying this Regulation may refuse first national
registration (first entry into service) of a vehicle which does not meet the requirements of the
06 series of amendments to this Regulation.
12. NAMES AND ADDRESSES OF TECHNICAL SERVICES CONDUCTING APPROVAL
TESTS, AND OF ADMINISTRATIVE DEPARTMENTS
The Parties to the Agreement which apply this Regulation shall communicate to the United
Nations Secretariat the names and addresses of the technical services responsible for
conducting approval tests and of the administrative departments which grant approval and to
which forms certifying approval or extension or refusal of withdrawal of approval or production
definitely discontinued, issued in other countries, are to be sent.

10. Number of gears...........................................................................................................................
11. Gears used ...................................................................................................................................
12. Final drive ratio(s).........................................................................................................................
13. Type and dimensions of tyres (by axle)........................................................................................
14. Maximum permissible weight including semi-trailer (where applicable).......................................
15. Brief description of the original exhaust system:..........................................................................
......................................................................................................................................................
15.1. Type(s) of original exhaust system(s): .........................................................................................
15.2. Type(s) of intake system(s) (if necessary in order to observe the noise level limit):....................
16. Load conditions of vehicles during test ........................................................................................
17. For stationary vehicle test: location and orientation of the microphone (by reference to
diagrams in Annex 3 - Appendix) .................................................................................................
18. Sound levels:
Vehicle in motion .................................................................. dB(A) at steady speed
before acceleration of ........................................................... km/h
Vehicle stationary ................................................................. dB(A) with engine running
at........................................................................................... rpm.
19. Deviations in calibration of sound level meter ..............................................................................
20. Vehicle submitted for approval on ................................................................................................
21. Technical service responsible for conducting approval tests .......................................................
......................................................................................................................................................
22. Date of report issued by that service............................................................................................
23. Number of report issued by that service.......................................................................................
24. Approval granted/extended/refused/withdrawn
25. Position of approval mark on the vehicle......................................................................................
26. Place.............................................................................................................................................

ANNEX 2
ARRANGEMENTS OF APPROVAL MARKS
MODEL A
(See Paragraph 5.4 of this Regulation)
The approval mark affixed to a vehicle shows that the vehicle type concerned has, with regard to its
noise emission, been approved in the Netherlands (E 4) pursuant to Regulation No. 9 under Approval
No. 062439. The approval number indicates that the approval was granted according to the
requirements of Regulation No. 9 as amended by the 06 series of amendments.
MODEL B
(See Paragraph 5.5 of this Regulation)
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved
in the Netherlands (E 4) pursuant to Regulations Nos. 9 and 33. The approval numbers indicate that,
at the date when the respective approvals were given, Regulation No. 9 included the 06 series of
amendments and Regulation No. 33 was still in its original form.

2.3. Miscellaneous
Measurements shall not be made in poor weather conditions. Precautions shall be taken to
ensure that readings are not influenced by wind gusts.
For measurement purposes, the weighted sound-level (A) of sound sources other than on the
test vehicle and the sound-level produced by the effect of the wind shall be at least 10 dB(A)
below the noise-level produced by the vehicle. The microphone may be fitted with a suitable
wind-guard, provided that its influence on the sensitivity and directional characteristics of the
microphone are taken into account.
If the difference between ambient and measured noise-levels is between 10 and 16 dB(A),
the appropriate figure shall be subtracted from the value recorded by the sound-level metre,
in accordance with the following graph:
2.4. Before the measurements are started, the engine shall be brought to its normal operating
regime as regards:
2.4.1. Temperatures;
2.4.2. Tuning;
2.4.3. Fuel;
2.4.4. Spark Plugs, Carburettor(s) and Other Parts.

3.1.2.2. Vehicle with a Manually-Operated Gearbox
If the vehicle is fitted with a two-speed, a three-speed or a four-speed gearbox, the second
gear shall be used. If the vehicle has more than four speeds, the third gear shall be used. If,
by following the above procedure, the engine speed developed exceeds its maximum
permissible regime, the first higher gear which ensures that this regime is no longer exceeded
up to the Line BB' of the measurement area should be used instead of the second or third
gear. Auxiliary step-up ratios ("overdrive") shall not be engaged. If the vehicle is fitted with a
differential with two gear ratios, the ratio selected shall be that allowing the highest vehicle
speed. The vehicle shall approach Line AA' at a steady speed corresponding either, in terms
of engine speed, to three-quarters of the engine speed at which the engine develops the
maximum power or to three-quarters of the maximum engine speed permitted by the
governor, or to 50 km/h, whichever is the lowest.
3.1.2.3. Vehicle with an Automatic Transmission
The vehicle shall approach the Line AA' at a steady speed of 50 km/h or at three-quarters of
its maximum speed, whichever is the lower. Where several forward-drive positions are
available, that position shall be selected which results in the highest mean acceleration of the
vehicle between Lines AA' and BB'. The selector position which is used only for engine
braking, parking or similar slow manoeuvres shall not be used.
3.2. Measurement of Noise of Stationary Vehicles (for testing of vehicles in service)
3.2.1. Acoustic Pressure Level Close to Vehicles
In addition, so as to facilitate the subsequent testing of vehicles in service, the acoustic
pressure level shall be measured near the outlet of the exhaust system (silencing system), in
conformity with the requirements set out below, and the result of the measurement shall be
included in the test report prepared for the issuance of the document referred to in Annex 1.
3.2.2. Measuring Instruments
The measurements shall be made using a precision sound-level meter in accordance with
Paragraph 1 of this annex.
3.2.3. Conditions for Measurements
3.2.3.1. Condition of the Vehicle
Before the measurements are started, the vehicle engine shall be brought to its normal
operating temperature. If the vehicle is equipped with automatic fans, no adjustment shall be
made to them during the measurement of the noise level.
While measurements are being made, the gear lever shall be in neutral. If the transmission
cannot be disconnected, the drive wheel of the vehicle should be allowed to run under
no-load conditions by, for example, placing the vehicle on a support or on rollers.

3.2.4.3. Operating Conditions
The engine speed shall be held steady at one of the following values:
1/2 S if S exceeds 5,000 rpm;
3/4 S if S does not exceed 5,000 rpm,
where S is the engine speed at which the engine produces its maximum power.
Once the steady speed is obtained, the throttle control shall be quickly returned to idling
position. The sound-level shall be measured for a brief period when the steady speed is
being maintained and throughout deceleration, and the valid result of the measurement shall
be that corresponding to the maximum reading on the sound-level meter.
3.2.4.4. The values, rounded off to the nearest whole decibel, shall be read from the measuring
apparatus. If the figure following the decimal point is between 0 and 4, the total is rounded
down and if between 5 and 9, it is rounded up.
Only values which are obtained from three consecutive measurements which do not differ by
more than 2 dB(A) shall be accepted. The highest of the three measurements will constitute
the test result.
4. INTERPRETATION OF RESULTS FOR VEHICLES IN MOTION
The values taken shall be rounded off to the nearest whole decibel. If the figure following the
decimal point is between 0 and 4, the total is rounded down and if between 5 and 9, it is
rounded up.
Only the values of readings obtained from two consecutive measurements made on the same
side of the vehicle and not differing by more than 2 dB(A) shall be accepted.
To allow for lack of precision in the readings, the result of each measurement shall be taken
as equal to the value obtained, less 1 dB(A).
If the average of the four readings does not exceed the maximum permissible level for the
category to which the tested vehicle belongs, the limit specified in Paragraph 6.2.1.3. shall be
deemed as being complied with. This average value shall constitute the test result.
4.1. The measurements shall be considered valid if the difference between the two consecutive
measurements on the same side of the vehicle is not more than 2 dB(A).
4.2. The figure recorded shall be that corresponding to the highest sound level. Should that figure
exceed by than 1 dB(A) the maximum sound level authorised for the category of vehicle
tested, a second series of two measurements shall be made. Three out of the four results so
obtained must fall within the prescribed limits.
4.3. To allow for lack of precision in the measuring instrument the figures read from it during
measurement shall each be reduced by 1 dB(A).

5.1.4.1.3. The two speed regimes must be alternated at least six times;
5.1.4.1.4. The complete test programme must include a minimum of 10 breaks of at least 3 hours'
duration in order to reproduce the effects of cooling and condensation.
5.1.4.2. Conditioning by pulsation
5.1.4.2.1. The exhaust system or components thereof must be fitted to the vehicle or to the engine.
In the former case, the vehicle must be mounted on a roller dynamometer. In the second
case, the engine must be mounted on a test bench.
The test apparatus, a detailed diagram of which is shown in Figure 3, shall be fitted at the
outlet of the exhaust system. Any other apparatus providing equivalent results shall be
acceptable.
5.1.4.2.2. The test equipment must be adjusted so that the flow of exhaust gases is alternately
interrupted and restored 2,500 times by a rapid-action valve.
5.1.4.2.3. The valve must open when the exhaust gas back-pressure, measured at least 100 mm
downstream of the intake flange, reaches a value of between 0.35 and 0.40 bar. Should such
a figure be unattainable because of the engine characteristics, the valve must open when the
gas back-pressure reaches a level equivalent to 90% of the maximum that can be measured
before the engine stops. It must close when this pressure does not differ by more than 10%
from its stabilised value with the valve open.
5.1.4.2.4. The time-delay switch must be set for the duration of exhaust gases calculated on the basis of
the requirements of Paragraph 5.1.4.2.3. above.
5.1.4.2.5. Engine speed must be 75% of the speed (S) at which the engine develops maximum power.
5.1.4.2.6. The power indicated by the dynamometer must be 50% of the full-throttle power measured at
75% of engine speed (S).
5.1.4.2.7. Any drainage holes must be closed off during the test.
5.1.4.2.8. The entire test must be completed within 48 hours. If necessary, a cooling period must be
allowed after each hour.
5.1.4.3. Conditioning on a test bench
5.1.4.3.1. The exhaust system must be fitted to an engine representative of the type fitted to the vehicle
for which the system is designed, and mounted on a test bench.

5.3. Intake Silencers
If the engine intake has to be fitted with an air filter and/or intake silencer in order to comply
with the permissible sound level, the filter and/or silencer shall be regarded as part of the
silencer and the requirements of Paragraphs 5.1. and 5.2. shall also be applicable to them.

Figure 2
Positions for Testing the Stationary Vehicle

ANNEX 4
SPECIFICATIONS FOR THE TEST SITE
1. INTRODUCTION
This annex describes the specifications relating to the physical characteristics and the laying of
the test track. These specifications based on a special standard describe the required
physical characteristics as well as the test methods for these characteristics.
2. REQUIRED CHARACTERISTICS OF THE SURFACE
A surface is considered to conform to this standard provided that the texture and voids content
or sound absorption coefficient have been measured and found to fulfil (all) the requirements of
Paragraphs 2.1. to 2.4. below and provided that the design requirements (Paragraph 3.2.) have
met.
2.1. Residual Voids Content
The residual voids content, V , of the test track paving mixture shall not exceed 8%. For the
measurement procedure, see Paragraph 4.1.
2.2. Sound Absorption Coefficient
If the surface fails to conform to the residual voids content requirement, the surface is
acceptable only if its sound absorption coefficient, α ≤ 0.10. For the measurement procedure,
see Paragraph 4.2. The requirement of Paragraphs 2.1. and 2.2. is met also if only sound
absorption has been measured and found to be α ≤ 0.10.
Note: The most relevant characteristic is the sound absorption, although the residual voids
content is more familiar among road constructors. However, sound absorption needs to be
measured only if the surface fails to comply with the voids requirement. This is because the
latter is connected with relatively large uncertainties in terms of both measurements and
relevance and some surfaces therefore may be rejected erroneously on the basis of the voids
measurement only.
2.3. Texture Depth
The texture depth (TD) measured according to the volumetric method (see Paragraph 4.3.
below) shall be:
TD ≥ 0.4 mm

3. TEST SURFACE DESIGN
3.1. Area
When designing the test track layout it is important to ensure that, as a minimum requirement,
the area traversed by the vehicles running through the test strip is covered with the specified
test material with suitable margins for safe and practical driving. This will require the width of
the track to be at least 3 m and the length of the track to extend beyond Lines AA and BB by at
least 10 m at either end. Figure 1 shows a plan of a suitable test site and indicates the
minimum area which shall be machine laid and machine compacted with the specified test
surface material. According to Annex 3, Paragraph 3.1.1.1., measurements have to be made
on each side of the vehicle. This can be done either by measuring with two microphone
locations (one on each side of the track) and driving in one direction, or measuring with a
microphone only on one side of the track but driving the vehicle in two directions. If the former
method is used, then there are no surface requirements on that side of the track where there is
no microphone.
Figure 1
Minimum Requirement for Test Surface Area.
The Shaded Part is called "Test Area".

Figure 2
Grading Curve of the Aggregate in the
Asphaltic Mix with Tolerances
In addition to the above, the following recommendations are given:
(a)
(b)
(c)
(d)
(e)
(f)
The sand fraction (0.063 mm < square mesh sieve size < 2 mm) shall include no more than
55% natural sand and at least 45% crushed sand;
The base and sub-base shall ensure a good stability and evenness, according to best road
construction practice;
The chippings shall be crushed (100% crushed faces) and of a material with a high resistance
to crushing;
The chippings used in the mix shall be washed;
No extra chippings shall be added onto the surface;
The binder hardness expressed as PEN value shall be 40-60, 60-80 or even 80-100 depending
on the climatic conditions of the country. The rule is that as hard a binder as possible shall be
used, provided this is consistent with common practice;

4.2. Sound Absorption Coefficient
The sound absorption coefficient (normal incidence) shall be measured by the impedance tube
method using the procedure specified in ISO/DIS 10 534: "Acoustics - Determination of sound
absorption coefficient and impedance by a tube method".
Regarding test specimens, the same requirements shall be followed as regarding the residual
voids content (see Paragraph 4.1.).
The sound absorption shall be measured in the range between 400 Hz and 800 Hz and in the
range between 800 Hz and 1,600 Hz (at least at the centre frequencies of third octave bands)
and the maximum values shall be identified for both of these frequency ranges.
Then these values, for all test cores, shall be averaged to constitute the final result.
4.3. Volumetric Macrotexture Measurement
For the purpose of this standard, texture depth measurements shall be made on at least
10 positions evenly spaced along the wheel tracks of the test strip and the average value taken
to compare with the specified minimum texture depth. For the description of the procedure see
Standard ISO 10844:1994.
5. STABILITY IN TIME AND MAINTENANCE
5.1. Age Influence
In common with any other surfaces, it is expected that the tyre/road noise level measured on
the test surface may increase slightly during the first 6-12 months after construction.
The surface will achieve its required characteristics not earlier than four weeks after
construction. The influence of age on the noise from trucks is generally less than on noise from
cars.
The stability over time is determined mainly by the polishing and compaction by vehicles driving
on the surface. It shall be periodically checked as stated in Paragraph 2.5.
5.2. Maintenance of the Surface
Loose debris or dust which could significantly reduce the effective texture depth must be
removed from the surface. In countries with winter climates, salt is sometimes used for
de-icing. Salt may alter the surface temporarily or even permanently in such a way as to
increase noise, and is therefore not recommended.
5.3. Repaving the Test Area
If it is necessary to repave the test track, it is usually unnecessary to repave more than the test
strip (of 3 m width in Figure 1) where vehicles are driving, provided the test area outside the
strip met the requirement of residual voids content or sound absorption when it was measured.

Noise - Three-wheel Vehicles.