Regulation No. 9-07

Name:Regulation No. 9-07
Description:Noise - Three-wheel Vehicles.
Official Title:Uniform Provisions Concerning the Approval of: Category L2, L4 and L5 Vehicles with Regard to Sound Emission.
Country:ECE - United Nations
Date of Issue:2013-12-02
Amendment Level:07 Series, Supplement 3
Number of Pages:40
Vehicle Types:Motorcycle
Subject Categories:Noise
Available on InterRegs.NET

Our online subscription service, offering immediate access to our extensive library of global vehicle regulations, standards and legislation. A fully searchable, accurate, user-friendly resource for consolidated regulations that are updated quickly and frequently.

Tell me more | Already a subscriber

Available on SelectRegs.com

Our fast and easy means of purchasing up-to-date global vehicle and component standards and regulations on a pay-as-you-go basis. Pay securely by credit card and your documents are delivered directly and immediately to your computer as PDF files.

Tell me more | Go straight to site

Keywords:

vehicle, test, regulation, sound, approval, type, engine, exhaust, speed, paragraph, system, surface, level, requirements, amendments, series, vehicles, silencing, annex, measured, measurements, measurement, maximum, date, microphone, reference, number, gear, force, track, manufacturer, mass, conditions, entry, figure, pressure, voids, rated, line, granted, fitted, made, area, absorption, tests, mark, means, category, measuring, content

Text Extract:

All InterRegs documents are formatted as PDF files and contain the full text, tables, diagrams and illustrations of the original as issued by the national government authority. We do not re-word, summarise, cut or interpret the regulatory documents. They are consolidated, published in English, and updated on a regular basis. The following text extract indicates the scope of the document, but does not represent the actual PDF content.

E/ECE/324
) Add.8/Rev.3/Amend.3
E/ECE/TRANS/505 )
December 5, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 9-07
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
CATEGORY L , L AND L VEHICLES WITH REGARD TO SOUND EMISSION
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
07 series of amendments
Date of Entry into Force: 03.11.13
Supplement 1 to the 07 series of amendments
Date of Entry into Force: 20.01.16
Supplement 2 to the 07 series of amendments
Date of Entry into Force: 09.02.17
Supplement 3 to the 07 series of amendments
Date of Entry into Force: 10.10.17

REGULATION
1. Scope
2. Definitions
REGULATION No. 9-07
UNIFORM PROVISIONS CONCERNING THE APPROVAL
OF CATEGORY L , L AND L VEHICLES WITH REGARD TO SOUND EMISSION
3. Application for approval
4. Markings
5. Approval
6. Specifications
CONTENTS
7. Modification and extension of approval of a vehicle type or a type of exhaust or silencing system(s)
8. Conformity of production
9. Penalties for non-conformity of production
10. Production definitively discontinued
11. Transitional provisions
12. Names and addresses of Technical Services responsible for conducting approval tests, and of
Type Approval Authorities
ANNEXES
Annex 1 : Communication
Annex 2 : Arrangements of approval marks
Annex 3 : Methods and instruments for measuring the noise made by motor vehicles
Annex 4 : Maximum sound level limits (new vehicles)
Annex 5 : Specifications for the test site

2.4. "Rated engine speed" of the combustion engine means the engine speed at which the
engine develops its rated maximum net power as stated by the manufacturer.
The symbol n denotes the rated engine speed expressed in min .
2.5. "Exhaust or silencing system(s)" means a complete set of components necessary for
limiting the sound emitted by a motor vehicle and its exhaust.
2.6. "Original exhaust or silencing system" means a system of the type with which the vehicle
is equipped on acceptance or extension of acceptance. It may be part of the original
equipment or a replacement.
2.7. ʺExhaust or Silencing Systems of Different Typesʺ means exhaust or silencing systems
which differ in such essential respects as:
2.7.1. That their components bear different trade names or marks;
2.7.2. That the characteristics of the materials constituting a component are different or that the
components differ in shape or size;
2.7.3. That the operating principles of at least one component are different;
2.7.4. That their components are assembled differently.
2.8. ʺExhaust or Silencing System Componentʺ means one of the individual constituent parts
whose assembly constitutes the exhaust or silencing system.
If the engine is fitted with an intake device (air filter and/or an intake sound absorber essential
in order to ensure conformity with sound level limits), this device shall be considered to be a
component of the same importance as the exhaust system proper, and be included in the list
referred to in Paragraph 3.2.2. below and carry the markings prescribed in Paragraph 4.1.
below.

3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to sound shall be submitted by its
manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the under mentioned 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 at least the following
identification marks:
4.1.1. The trade name or mark of the manufacturer of the exhaust or silencing system and of its
components;
4.1.2. The trade description given by the manufacturer;
4.1.3. The identifying part numbers;
4.1.4. For all original silencers, the "E" mark followed by the identification of the country which
granted the component type approval.
4.1.5. Any packing of original replacement exhaust or silencing systems shall be marked legibly with
the words "original part" and the make and type references integrated together with the
"E" mark and also the reference of the country of origin.
4.1.6. Such markings shall be indelible, clearly legible and also visible, in the position at which it is
to be fitted to the vehicle.

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.
6.1.3. The following information shall be provided on the motor vehicle in an easily accessible but
not necessarily immediately visible location:
(a) The manufacturer's name;
(b) The target engine speed and the final result of the stationary test as defined in
Paragraph 3.2.4. of Annex 3.
6.2. Specifications Regarding Sound Levels
6.2.1. Methods of Measurement
6.2.1.1. The sound emitted by the vehicle type submitted for approval shall be measured by the
method(s) described in Annex 3 to this Regulation for the vehicle in motion and for the vehicle
when stationary, in the case of a vehicle with an electric motor or with an internal
combustion engine that does not operate when the vehicle is stationary, the emitted sound
shall only be measured when the vehicle is in motion.
If the vehicle has user selectable software programs or modes which affect the sound
emission of the vehicle, all these modes shall be in compliance with the requirements in this
Paragraph. Testing shall be based on the worst case scenario.
For hybrid electric vehicles, the tests shall be performed twice under the following conditions:
(a) Condition A:
The batteries shall be at their maximum state of charge; if more than one 'hybrid
mode' is available, the most electric hybrid mode shall be selected for the test;
(b) Condition B:
The batteries shall be at their minimum state of charge; if more than one 'hybrid
mode' is available, the most fuel-consuming hybrid mode shall be selected for the
test.
The final result is the highest of the test results for conditions A and B.

8. CONFORMITY OF PRODUCTION
The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2), with the following requirements:
8.1. Every vehicle bearing an approval mark as prescribed under this Regulation shall conform to
the vehicle type approved, be fitted with the exhaust or silencing system with which it was
approved and satisfy the requirements of Paragraph 6 above.
8.2. In order to verify conformity as prescribed in Paragraph 8.1 above, a vehicle, bearing the
approval mark required by this Regulation, shall be taken from the series. Production shall be
deemed to conform to the requirements of this Regulation if the levels measured using the
method described in Annex 3 do not exceed by more than 3dB(A) the value measured on
acceptance, nor by more than 1d(B)A the limits prescribed in Paragraph 6.2.1.3. above.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a vehicle type pursuant to this Regulation may be
withdrawn if the requirements laid down in Paragraph 8 above are not complied with, or if the
vehicle fails to pass the tests provided for in Paragraph 8.2. above.
9.2. If a Party to the Agreement which applies this Regulation withdraws an approval it has
previously granted, it shall forthwith so notify the other Contracting Parties applying this
Regulation by means of a communication form conforming to the model in Annex 1 to this
Regulation.
10. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a vehicle or an exhaust or
silencing system approved in accordance with this Regulation, he shall so inform the Type
Approval Authority which had granted the approval. Upon receiving the relevant
communication, that Authority shall inform thereof the other Parties to the Agreement applying
this Regulation by means of a communication form conforming to the model given in Annex 1
to this Regulation.
11. TRANSITIONAL PROVISIONS
11.1. As from the official date of entry into force of the 07 series of amendments, no Contracting
Party applying this Regulation shall refuse to grant or refuse to accept type approvals under
this Regulation as amended by the 07 series of amendments.
11.2. As from 24 months after the date of entry into force of the 07 series of amendments,
Contracting Parties applying this Regulation shall grant type approvals only if the vehicle type
to be approved meets the requirements of this Regulation as amended by the 07 series of
amendments.
11.3. Contracting Parties applying this Regulation shall not refuse to grant extensions of type
approvals for existing types which have been granted according to the preceding series of
amendments to this Regulation.
11.4. Until 24 months after the date of entry into force of the 07 series of amendments to this
Regulation, no Contracting Party applying this Regulation shall refuse national or regional
type approval of a vehicle type-approved to the preceding series of amendments to this
Regulation.

ANNEX 1
COMMUNICATION
(Maximum format: A4 (210 × 297mm)
issued by:
Name of administration:
.................................................................
.................................................................
.................................................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITIVELY DISCONTINUED
of a vehicle type with regard to its sound emission pursuant to UN Regulation No. 9
Approval No. ........................................ Extension No. ..........................................................
1. Trade name or mark of vehicle: ....................................................................................................
2. Vehicle type: .................................................................................................................................
2.1. Variant(s) (as necessary): ............................................................................................................
2.2. Version(s) (as necessary): ............................................................................................................
3. Manufacturer's name and address ...............................................................................................
4. If applicable, name and address of manufacturer's representative ..............................................
5. Combustion engine ...........................................................................................................................
5.1. Engine manufacturer ...................................................................................................................... ..
5.2. Engine type .......................................................................................................................................
5.3. Kind of engine: e.g., positive-ignition, compression ignition, etc. ............................................... ...
5.4. Cycles: two-stroke or four-stroke (if applicable) ........................................................................... ..
5.5. Engine capacity (if applicable): .................................................................................................. cm

16.3. Sound pressure level L : ................................................................................................. ...dB(A)
17. Vehicle submitted for approval on: ........................................................................................... ...
18. Technical Service responsible for conducting approval tests: .................................................. ..
19. Date of report issued by that Service: ...................................................................................... ...
20. Number of report issued by that service .......................................................................................
21. Approval granted/extended/refused/withdrawn
22. Position of approval mark on the vehicle ......................................................................................
23. Place .............................................................................................................................................
24. Date ..............................................................................................................................................
25. Signature ......................................................................................................................................
26. The following documents, bearing the approval number shown above, are annexed to this
communication:
(a)
(b)
(c)
Drawings, diagrams and plans of the engine and of the exhaust or silencing system;
Photographs of the engine and of the exhaust or silencing system;
List of components, duly identified constituting the exhaust or silencing system.

ANNEX 3
METHODS AND INSTRUMENTS FOR MEASURING THE SOUND
EMITTED BY L , L AND L CATEGORY VEHICLES
1. MEASURING INSTRUMENTS
1.1. General
The apparatus used for measuring the sound pressure level shall be a sound level meter or
equivalent measuring system meeting the requirements of Class 1 instruments (inclusive of
the recommended windscreen, if used). These requirements are described in
IEC 61672-1:2002. Measurements shall be carried out using the time weighting "F" of the
acoustic measuring instrument and the "A" frequency weighting curve also described in
IEC 61672-1:2002. When using a system that includes periodic monitoring of the A-weighted
sound pressure level, a reading should be made at a time interval not greater than 30ms. The
instruments shall be maintained and calibrated in accordance with the instructions of the
instrument manufacturer.
1.2. Calibration
At the beginning and at the end of every measurement session, the entire acoustic measuring
system shall be checked by means of a sound calibrator that fulfils the requirements of
Class 1 sound calibrators according to IEC 60942:2003. Without any further adjustment, the
difference between the readings shall be less than or equal to 0.5dB(A). If this value is
exceeded, the results of the measurements obtained after the previous satisfactory check
shall be discarded.
1.3. Compliance with Requirements
Compliance of the sound calibrator with the requirements of IEC 60942:2003 shall be verified
once a year. Compliance of the instrumentation system with the requirements of
IEC 61672-1:2002 shall be verified at least every two years. All compliance testing shall be
conducted by a laboratory which is authorized to perform calibrations traceable to the
appropriate standards.
1.4. Instrumentation for Speed Measurements
The rotational speed of the engine shall be measured with an instrument meeting
specification limits of at least ±2% or better at the engine speeds required for the
measurements being performed.
The road speed of the vehicle shall be measured with instruments meeting specification limits
of at least ±0.5km/h when using continuous measuring devices. If testing uses independent
measurements of speed, this instrumentation shall meet specification limits of at least
±0.2km/h.

Table 1
Correction Applied to Individual Measured Test Value
Background sound pressure level difference
to measured sound pressure level, in dB
10 11 12 13 14 ≥15
2.2. Condition of the Vehicle
2.2.1. General Conditions
Correction, in dB(A) 0.5 0.4 0.3 0.2 0.1 0.0
The vehicle shall be supplied as specified by the vehicle manufacturer.
Before the measurements are started, the vehicle shall be brought to its normal operating
conditions as regards.




Temperatures;
Tuning;
Fuel;
Sparking plugs, carburettor(s), etc., (as appropriate).
If the vehicle is fitted with fans with an automatic actuating mechanism, this system shall not
be interfered with during the sound measurements.
If the vehicle is equipped with devices which are not necessary for its propulsion, but which
are used whilst the vehicle is in normal service on the road, those devices shall be in
operation in accordance with the specifications of the manufacturer.
For vehicles having more than one driven wheel, only the drive provided for normal road
operation may be used. If the vehicle is fitted with a trailer or a semi-trailer, this shall be
removed for the purposes of the test.
2.2.2. Test Mass of the Vehicle
The vehicle shall be tested with its test mass as defined in Paragraph 2.10. of this Regulation.
2.2.3. Tyre Selection and Condition
The tyres shall be appropriate for the vehicle and shall be inflated to the pressure
recommended by the vehicle manufacturer for the test mass of the vehicle.
The tyres shall be selected by the vehicle manufacturer, and correspond to one of the tyre
sizes and types designated for the vehicle by the vehicle manufacturer. The minimum tread
depth shall be at least 80% of the full tread depth.

Figure 1
Measuring Positions for Vehicles in Motion
3.1.2.2. Determination of the Approach Vehicle Speed and the Gear Use
3.1.2.2.1. Vehicle with no gearbox
The vehicle shall approach line AA' at a steady vehicle speed v ' corresponding either, in
terms of engine speed, (min ) to 75% of the rated engine speed as defined in
Paragraph 2.4 of this Regulation, or to 75% of the maximum engine speed permitted by the
governor, or to 50km/h, whichever is the lowest.
3.1.2.2.2. Vehicles with manual transmissions, automatic transmissions, or transmissions with
continuously variable transmission ratios (CVT's) tested with locked gears
If the vehicle is fitted with a dual mode transmission (e.g. low and high), the mode for normal
on-road operation shall be selected.
If the vehicle is fitted with a gearbox with two or three or four forward gears or the same
number of lockable gears in automatic transmission or in CVT, the second gear shall be used.
If the gearbox has more than four forward gears or the same number of lockable gears in
automatic transmission or in CVT, the third gear shall be used.

3.1.4. Calculation of the Final Test Result
The final test result is the average of the four test results 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 it is between 5 and 9, it is rounded up.
In case of hybrid electric vehicles, the final result is the highest of the test results for
conditions A and B as described in Paragraph 6.2.1.1. of this Regulation.
3.2. Measurement of the Sound Emitted by Stationary Vehicles (for Testing of Vehicles in
Use)
3.2.1. Sound Pressure Level Close to the Outlet(s) of the Exhaust System
In addition, so as to facilitate the subsequent testing of vehicles in service, the sound
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 to
this Regulation.
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
3.2.3.2. Test Site
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 sound 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.
Any area not subject to major acoustic perturbations may be used as a test site. Level areas
covered with concrete, asphalt or some other hard material and are highly reflective are
suitable; surfaces consisting of earth which has been tamped down shall not be used. The
test site shall have at least the dimensions of a rectangle the sides of which shall be 3m from
the outline of the vehicle (excluding handlebars). No significant obstacle such as a person
other than the observer and the driver shall be within this rectangle.
The vehicle shall be placed within the above-mentioned rectangle in such a way that the
measuring microphone is at least one metre away from any stone edging.

Figure 3
Reference Point
The reference point shall be the highest point satisfying the following conditions:
(a)
(b)
The reference point shall be at the end of the exhaust pipe,
The reference point shall be on the vertical plane containing the exhaust outlet centre
and the flow axis of the exhaust pipe termination.
If two microphone positions are possible, the location farthest laterally from the vehicle
longitudinal centreline shall be used.
If the flow axis of the exhaust outlet pipe is at 90° ± 5° to the vehicle longitudinal centreline,
the microphone shall be located at the point that is the furthest from the engine.
If a vehicle has two or more exhaust outlets spaced less than 0.3m apart and connected to a
single silencer, only one measurement shall be made. The microphone shall be located
relative to the outlet the farthest from the vehicle's longitudinal centreline, or, when such outlet
does not exist, to the outlet that is highest above the ground.
For vehicles having an exhaust provided with outlets spaced more than 0.3m apart, one
measurement is made for each outlet as if it were the only one, and the highest sound
pressure level shall be noted.
For the purpose of roadside checking, the reference point may be moved to the outer surface
of the vehicle body.
For vehicles equipped with multiple exhaust outlets, the reported sound pressure level shall
be for the outlet having the highest average sound pressure level.

4. SOUND FROM THE VEHICLE IN MOTION (DATA REPORTED TO FACILITATE TESTING
OF THE VEHICLE IN USE)
4.1. A test procedure for in use compliance tests may be defined by a Contracting Party, taking
due account of any differences from the test conditions used at type-approval.
4.2. In order to facilitate in use compliance test of vehicles, the following information relating to the
sound-pressure level measurements carried out in accordance with Paragraph 1. of Annex 3
for the vehicle in motion is referred to as in use compliance reference data:
(a)
Gear (i) or, for vehicles tested with non-locked gear ratios, the position of the gear
selector chosen for the test;
(b)
The vehicle speed v
in km/h at the beginning of the full throttle acceleration test in
gear (i); and
(c)
The final test result in dB(A) as determined according to Paragraph 3.1.4 of this Annex.
4.3. The in use compliance reference data shall be entered in the communication form conforming
to Annex 1.
5. ORIGINAL EXHAUST (SILENCING) SYSTEM
5.1. Requirements for Silencers Containing Absorbent Fibrous Materials
5.1.1. Fibrous absorbent material shall be asbestos-free and may be used in the construction of
silencers only if suitable devices ensure that the fibrous absorbent material is kept in place for
the whole time that the silencer is being used and the exhaust or silencing system meets the
requirements of any one of Paragraphs 5.1.2., 5.1.3. 5.1.4. or 5.1.5. below.
5.1.2. After removal of the fibrous material, the sound-level shall conform to the requirements of
Paragraph 6.2.1.3. of this Regulation.
5.1.3. The fibrous absorbent material may not be placed in those parts of the silencer through which
the exhaust gases pass and shall conform to the following requirements:
5.1.3.1. The material shall be heated at a temperature of 650°C ± 5°C for 4h in a furnace without
reduction in the average length, diameter or bulk density of the fibre;
5.1.3.2. After heating at 650°C ± 5°C for 1h in a furnace, at least 98% of the material shall be retained
in a sieve of nominal aperture size 250μm conforming to ISO Standard 3310/1:2000 when
tested in accordance with ISO Standard 2559:2011.
5.1.3.3. The loss in weight of the material shall not exceed 10.5% after soaking for 24h at 90°C ± 5°C
in a synthetic condensate of the following composition:
1N hydrobromic acid (HBr)
1N sulphuric acid (H SO )
Distilled water to make up to
10ml
10ml
1,000ml
Note: The material must be washed in distilled water and dried for 1h at 105°C before
weighing.

1.
Inlet flange or sleeve for connection to the rear of the test exhaust system
2.
Hand-operated regulating valve.
3.
Compensating reservoir with a maximum capacity of 40L and a filling time of not less
than 1s.
4.
Pressure switch with an operating range of 5 to 250kPa.
5.
Time delay switch.
6.
Pulse counter.
7.
Quick-acting valve, such as exhaust brake valve 60mm in diameter, operated by a
pneumatic cylinder with an output of 120N at 400kPa. The response time, both when
opening and closing, shall not exceed 0.5s.
8.
Exhaust gas evacuation.
9.
Flexible pipe.
10.
Pressure gauge.
Figure 4
Test Apparatus for Conditioning by Pulsation
5.1.4.2.2. The test equipment shall 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 shall open when the exhaust gas back-pressure, measured at least 100mm
downstream of the intake flange, reaches a value of between 35 and 40kPa. Should such a
figure be unattainable because of the engine characteristics, the valve shall open when the
gas back-pressure reaches a level equivalent to 90% of the maximum that can be measured
before the engine stops. It shall 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 shall 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 shall be 75% of the rated engine speed as defined in Paragraph 2.4 of this
Regulation.
5.1.4.2.6. The power indicated by the dynamometer shall be 50% of the full-throttle power measured at
75% of the rated engine speed as defined in Paragraph 2.4 of this Regulation.

5.1.5. Exhaust gases are not in contact with fibrous materials and fibrous materials are not under
the influence of pressure variations.
5.2. Diagram and Markings
5.2.1. The diagram and a dimensional cross-section of the silencer shall be annexed to the
document mentioned in Annex 1 to this Regulation.
5.2.2. All original silencers shall bear at least the following:
(a)
(b)
(c)
The 'E' mark followed by the reference to the country which granted the type-approval;
The vehicle manufacturer's name or trademark; and
The make and identifying part number.
This reference shall be legible, indelible and visible in the position at which it is to be fitted.
5.2.3. Any packaging of original replacements for exhaust or silencing systems shall be marked
legibly with the words "original part" and the make and type reference integrated together with
the "E" mark and also the reference of the country of origin.
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. above shall also be applicable to
them.

ANNEX 5
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.
below) have been 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. below.
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. below. The requirements of Paragraphs 2.1. above and this Paragraph are
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 ≥ 0.4mm

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 3m and the length of the track to extend beyond Lines AA and BB by at
least 10m 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 latter 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) The sand fraction (0.063mm < square mesh sieve size < 2mm) shall include no more than 55%
natural sand and at least 45% crushed sand;
(b)
(c)
(d)
(e)
(f)
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. above).
The sound absorption shall be measured in the range between 400Hz and 800Hz and in the
range between 800Hz and 1,600Hz (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 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. above.
5.2. Maintenance of the Surface
Loose debris or dust which could significantly reduce the effective texture depth shall 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 3m 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.