Regulation No. 63-02 Proposed Supplement 3

Name:Regulation No. 63-02 Proposed Supplement 3
Description:Noise - Mopeds. Proposed Supplement 3 to the 02 Series.
Official Title:Proposal for Supplement 3 to the 02 Series of Amendments to Regulation No. 63 (Noise Emissions of Mopeds).
Country:ECE - United Nations
Date of Issue:2016-12-22
Amendment Level:Original
Number of Pages:36
Vehicle Types:Motorcycle
Subject Categories:Drafts and Proposals (Current)
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Keywords:

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

Text Extract:

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ECE/TRANS/WP.29/2017/4
PROPOSAL FOR SUPPLEMENT 3 TO THE 02 SERIES OF
AMENDMENTS TO
REGULATION NO. 63
(NOISE EMISSIONS OF MOPEDS)
ADOPTED AT THE 171 SESSION – MARCH 2017
PROVISIONAL DATE OF ENTRY INTO FORCE: OCTOBER 10, 2017

1. Scope
2. Definitions
This Regulation applies to vehicles of Category L with regard to sound emission.
For the purposes of this Regulation,
2.1. "Approval of a vehicle" means the approval of a vehicle type with regard to sound
emission and the original exhaust system as a technical unit of a two-wheeled type of
vehicle;
2.2. "Vehicle type" means a category of vehicles which do not differ in such essential respects
as:
2.2.1. The type of engine (two stroke or four stroke; with reciprocating or rotary pistons; number
and capacity of cylinders; number and type of carburettors or injection systems;
arrangement of valves; rated maximum net power and rated engine speed).
For rotary piston engines, the cubic capacity should be taken to be double of the volume of
the chamber;
2.2.2. Drive train, in particular the number and ratios of gears of the transmission and the final
ratio;
2.2.3. The number, type and arrangement of exhaust systems;
2.3. "Exhaust or silencing system" means a complete set of components necessary for
limiting the sound emitted by the engine of the vehicle and its exhaust.
2.4. "Original exhaust or silencing system" means a system of the type fitted to the vehicle
on approval or extension of approval. It may be original or a replacement.
2.5. "Non-original exhaust or silencing system" means a system of a type different from that
fitted to the vehicle on approval or extension of approval. It may be used only as a
replacement exhaust or silencing system.
2.6. "Rated maximum net power"
For vehicles with a combustion engine "rated maximum net power" means the rated engine
power as defined in ISO 4106:2012.
The symbol P denotes the numerical value of the rated maximum net power expressed
in kW.
2.7. "Rated engine speed" 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 .

2.10.2. The reference mass of an L Category vehicle shall exclude the mass of:
(a)
(b)
(c)
The machines or equipment installed on the load platform area;
In the case of mono-fuel, bi-fuel or multi-fuel vehicles, a gaseous fuel system as well
as storage tanks for gaseous fuel; and
In the case of pre-compressed air propulsion, storage tanks to store compressed air.
2.11. Test Mass
The test mass is the reference mass plus the combined mass of the driver and test
equipment.
The combined mass of the driver and test equipment used on the vehicle shall not be more
than 90kg nor less than 70kg. Weights shall be placed on the vehicle, if the 70kg minimum
is not reached.
2.12. Maximum Vehicle Speed
The maximum vehicle speed is the maximum design vehicle speed measured according to
ISO 7116:2011.
3. Application for Approval
3.1. The application for approval of a vehicle type with regard to the sound emitted by vehicles
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 responsible for 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 responsible for conducting approval tests.

5.5. If the vehicle conforms to a vehicle type approved, under one or more Regulations Annexed
to the Agreement, in the country which has granted approval under this Regulation, the
symbol prescribed in Paragraph 5.4.1. above need not be repeated; in such a case the
Regulation and approval numbers and the additional symbols of all the Regulations under
which approval has been granted in the country which has granted approval under this
Regulation shall be placed in vertical columns to the right of the symbol prescribed in
Paragraph 5.4.1. above.
5.6. The approval mark shall be clearly legible and be indelible.
5.7. The approval mark shall be placed close to or on the vehicle data plate.
5.8. Annex 2 to this Regulation gives arrangements of approval marks.
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 vehicle in an easily accessible but not
necessarily immediately visible location:
(a)
(b)
The manufacturer's name;
The target engine speed and the final result of the stationary test as defined in
Paragraph 3.2. of Annex 3 to this Regulation.
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 when
stationary. In the case of a vehicle with an internal combustion engine that does not
operate when the vehicle is stationary, the emitted sound shall only be measured in motion.
6.2.1.2. The value(s) 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 Paragraph 3.1. of Annex 3 to this
Regulation when the vehicle is in motion shall not exceed the limits prescribed (for new
vehicles and new exhaust or silencing systems) in Annex 4 to this Regulation for the
category to which the vehicle belongs.

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 level measured by the
method described in Paragraph 3.1. of Annex 3 to this Regulation does not exceed by more
than 3dB(A) the value measured during type approval nor by more than 1 dB(A) the limits
prescribed in Annex 4 to this Regulation.
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 8.1. above are not complied with, or if
the vehicle has failed 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 Parties to the 1958 Agreement
applying this Regulation, by means of a communication form conforming to the model in
Annex 1 to this Regulation.
10. Transitional Provisions
10.1. As from the official date of entry into force of the 02 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 02 series of amendments.
10.2. As from 24 months after the date of entry into force of the 02 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 02 series
of amendments.
10.3. 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.
10.4. Until 24 months after the date of entry into force of the 02 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.
10.5. As from 24 months after the date of entry into force of the 02 series of amendments to this
Regulation, Contracting Parties applying this Regulation shall not be obliged to accept, for
the purpose of national or regional type approval, a vehicle type approved to the preceding
series of amendments to this Regulation.
10.6. Notwithstanding the transitional provisions above, Contracting Parties whose application of
this Regulation comes into force after the date of entry into force of the most recent series of
amendments are not obliged to accept type approvals which were granted in accordance
with any of the preceding series of amendments to this Regulation are only obliged to
accept type approval granted in accordance with the 02 series of amendments.
10.7. As from the official date of entry into force of Supplement 1 to the 02 series of amendments,
no Contracting Party applying this Regulation shall refuse to grant or refuse to accept type
approval according to Supplement 1 to 02 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 DEFINITELY DISCONTINUED
of a vehicle type with regard to its sound emission pursuant to Regulation No. 63
Approval No. ...................................
Extension No. ...........................................
1.
Trade name or mark of the vehicle: ..................................................................................................
2.
Vehicle type: .....................................................................................................................................
3.
Variant(s) (if applicable): ...................................................................................................................
4.
Version(s) (if applicable): ..................................................................................................................
5.
Name and address of manufacturer: ................................................................................................
6.
Name and address of manufacturer's representative (if applicable): ...............................................
7.
Type(s) of original exhaust system(s): ..............................................................................................
8.
Type(s) of intake device(s) (if required in order to ensure conformity with sound level limits): ........
9.
Type of engine:
..............................................................................................................................
10.
Cycles: 2-stroke or 4-stroke (if applicable)

22. Technical Service responsible for conducting approval tests: ..........................................................
23. Date of report issued by that Service: ..............................................................................................
24. Number of report issued by that Service: .........................................................................................
25. Approval granted/refused/extended/withdrawn
26. Position of approval mark on the vehicle: .........................................................................................
27. Place: ................................................................................................................................................
28. Date: .................................................................................................................................................
29. Signature: ..........................................................................................................................................
30. 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 duly identified components constituting the exhaust or silencing system.

ANNEX 3
METHODS AND INSTRUMENTS FOR MEASURING
THE SOUND EMITTED BY L CATEGORY VEHICLES
1. MEASURING INSTRUMENTS
1.1. Acoustic Measurements
1.1.1. 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 61672-1:2013.
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 61672-1:2013. 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.
1.1.2. 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.
1.1.3. 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-
1:2013 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.
1.2. 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 vehicle 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 Condition
Correction, in dB(A) 0.5 0.4 0.3 0.2 0.1 0.0
Before the measurements are started, the engine 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.
2.2.2. Test Mass and Tyre Selection
2.2.2.1. The vehicle shall be tested with its test mass as defined in Paragraph 2.9 of this Regulation.
2.2.2.2. 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.

3.1.2. Acceleration Test Execution, Approach Vehicle Speed and Gear Use
3.1.2.1. Acceleration Test Execution
The vehicle shall approach line AA' at an initial steady speed as specified below. When the
front of the vehicle reaches line AA' the throttle shall be fully opened as quickly as practically
possible and kept in that position until the rear of the vehicle reaches line BB'; the throttle
shall then be returned as quickly as possible to the idle position.
For all measurements, the vehicle shall be driven in a straight line along the test track in
such a way that the track of the median longitudinal plane of the vehicle is as close as
possible to the line CC'.
3.1.2.2. Approach Vehicle Speed
3.1.2.3. Gear Use
The vehicle shall approach the line AA' at a steady vehicle speed equal to its maximum
vehicle speed as defined in Paragraph 2.12 of this Regulation, if the latter is below or equal
to 30km/h. If the maximum vehicle speed is above 30km/h, the vehicle shall approach AA' at
a steady speed of 30km/h.
If the vehicle is fitted with a manually operated gearbox, the highest gear shall be selected
which enables it to pass over the line AA' with an engine speed above or equal to 50% of
rated engine speed as defined in Paragraph 2.7. of this Regulation.
If the vehicle is fitted with automatic transmission, it shall be driven at the vehicle speeds
indicated in 3.1.2.2. above.
3.1.3. Sound Level Determination
The maximum sound level recorded at each side of the vehicle shall be reduced by 1dB(A)
to account for measurement inaccuracy and mathematically rounded to the nearest first
decimal place (e.g. 68.45 shall be noted as to 68.5 while 68.44 shall be noted as to 68.4).
These values constitute the results of the measurement.
The measurement will be invalid if an abnormal discrepancy is recorded between the peak
value and the general sound level.
At least two valid measurements shall be made on each side of the vehicle.
The measurements shall be considered valid if the difference between the results of the two
consecutive measurements on the same side of the vehicle is not more than 2dB(A).
Preliminary measurements may be made for adjustment purposes, but shall be disregarded
for the determination of the measurement results.
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.

3.2.3.3. Measuring of Sound in Proximity to the Exhaust
3.2.3.3.1. Position of the microphone (see Figure 2)
The microphone shall be located at a distance of 0.5 ± 0.01m from the reference point of the
exhaust pipe defined in Figure 3 and at an angle of 45° ± 5° to the vertical plane containing
the flow axis of the pipe termination. The microphone shall be at the height of the reference
point, but not less than 0.2m from the ground surface. The reference axis of the microphone
shall lie in a plane parallel to the ground surface and shall be directed towards the reference
point on the exhaust outlet.
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.

Figure 3
Reference Point
3.2.3.3.2. Operating conditions of the engine
3.2.3.3.2.1. Engine speed shall be held steady at one of the following values:
50% of n , if n exceeds 5,000min
75% of n , if n does not exceed 5,000min
where n is the rated engine speed as defined in Paragraph 2.7 of this Regulation.
For a vehicle which cannot reach, in a stationary test, the target engine speed defined
above, 95% of the maximum engine speed reachable in a stationary test shall be used
instead as target engine speed.
3.2.3.3.2.2. The engine speed shall be gradually increased from idle to the target engine speed and held
constant within a tolerance band of ±5%. Then the throttle control shall be rapidly released
and the engine speed shall be returned to idle. The sound pressure level shall be measured
during a period consisting of constant engine speed of at least 1s and throughout the entire
deceleration period. The maximum sound level meter reading shall be taken as the test
value.
A measurement shall be valid only if the test engine speed did not deviate from the target
engine speed by more than the specified tolerance of ±5% for at least 1s.
3.2.3.3.2.3. Multi-mode exhaust system
Vehicles equipped with a multiple mode, manually or electronically adjustable exhaust
system shall be tested in all modes.

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 ± 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 ± 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 3310-1:2000 when tested in
accordance with ISO 2559:2011;
5.1.3.3. The loss in weight of the material shall not exceed 10.5% after soaking for 24h at 90 ± 5°C
in a synthetic condensate of the following composition:
1N hydrobromic acid (HBr)
1N sulphuric acid (H SO )
10ml
10ml
Distilled water to make up to 1,000ml
The material shall be washed in distilled water and dried for one hour at 105°C before
weighing.
5.1.4. Before the system is tested in accordance with Paragraph 3.1. of this Annex, it shall be put
into a normal state for road use by one of the following methods:
5.1.4.1. Conditioning by Continuous Road Operation:
5.1.4.1.1. The minimum distance to be completed during conditioning shall be 2,000km.
5.1.4.1.2. 50% ± 10% of this conditioning cycle shall consist of town driving and the remainder of long
distance runs; the continuous road cycle may be replaced by a corresponding test track
programme.
5.1.4.1.3. The two vehicle speed regimes shall be alternated at least six times.
5.1.4.1.4. The complete test programme shall include a minimum of 10 breaks of at least 3h 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 shall be fitted to the vehicle or to the engine.
In the former case, the vehicle shall be mounted on a roller dynamometer. In the second
case, the engine shall be mounted on a test bench.
The test apparatus, a detailed diagram of which is shown in Figure 4, 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 shall be adjusted so that the flow of exhaust gases is alternately
interrupted and restored 2,500 times by a rapid-action valve.

5.1.4.2.5. The engine speed shall be 75% of the rated engine speed as defined in Paragraph 2.7. 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 2.7. of this Regulation.
5.1.4.2.7. Any drainage holes shall be closed off during the test.
5.1.4.2.8. The entire test shall be completed within 48h. If necessary, a cooling period shall be allowed
after each hour.
5.1.4.3. Conditioning on a Test Bench:
5.1.4.3.1. The exhaust system shall 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.
5.1.4.3.2. Conditioning shall consist of three cycles.
5.1.4.3.3. Each test bench cycle shall be followed by a break of at least six hours in order to reproduce
the effects of cooling and condensation.
5.1.4.3.4. Each test bench cycle shall consist of six phases. The engine conditions for and the
duration of each phase shall be:
Phase Conditions Duration of phase in minutes
1 Idling 6
2 25% load at 75% of n 40
3 50% load at 75% of n 40
4 100% load at 75% of n 30
5 50% load at 100% of n 12
6 25% load at 100% of n 22
Total time
2h 30min
5.1.4.3.5. During this conditioning procedure, at the request of the manufacturer, the engine and the
silencer may be cooled in order that the temperature recorded at a point not more than
100mm from the exhaust gas outlet does not exceed that measured when the vehicle is
running at 75% of the rated engine speed (as defined in Paragraph 2.7 of this Regulation) in
top gear. The engine and/or vehicle speeds shall be determined with a tolerance of ±3%.
5.1.5. Exhaust gases are not in contact with fibrous materials and fibrous materials are not under
the influence of pressure variations.

ANNEX 4
MAXIMUM SOUND LEVEL LIMITS (NEW VEHICLES)
Maximum design speed in km/h
≤25
>25
Maximum sound level values in dB(A)
66
71

2.4. Homogeneity of the Surface
Every practical effort shall be made to ensure that the surface is made to be as
homogeneous as possible within the test area. This includes the texture and voids content,
but it should also be observed that if the rolling process results in more effective rolling at
some places than at others, the texture may be different and unevenness causing bumps
may also occur.
2.5. Period of Testing
In order to check whether the surface continues to conform to the texture and voids content
or sound absorption requirements stipulated in this standard, periodic testing of the surface
shall be done at the following intervals:
(a)
For residual voids content or sound absorption:
When the surface is new; if the surface meets the requirements when new, no further
periodical testing is required.
(b)
For Texture Depth (TD):
When the surface is new; when the sound testing starts (Note: Not before 4 weeks
after laying); then every 12 months.
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 to this Regulation,
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.

3.2.2. Design Guidelines
As a guide to the surface constructor, an aggregate grading curve which will give desired
characteristics is shown in Figure 2. In addition, Table 1 gives some guidelines for obtaining
the desired texture and durability. The grading curve fits the following formula:
P (% passing) = 100 · (d/d )
where:
d
= square mesh sieve size, in mm
d = 8mm for the mean curve
d = 10mm for the lower tolerance curve
d = 6.3mm for the upper tolerance
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)
The sand fraction (0.063mm 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;

If there is a suspicion that the condition of homogeneity is not met (see Paragraph 2.4. of
this Annex), cores shall be taken from more locations within the test area. The residual
voids content has to be determined for each core, then the average value from all cores
shall be calculated and compared with the requirement of Paragraph 2.1. of this Annex. In
addition, no single core shall have a voids value which is higher than 10%. The test surface
constructor is reminded of the problem which may arise when the test area is heated by
pipes or electrical wires and cores shall be taken from this area. Such installations shall be
carefully planned with respect to future core drilling locations. It is recommended that a few
locations of size approximately 200 × 300mm should be left where there are no wires/pipes
or where the latter are located deep enough in order not to be damaged by cores taken from
the surface layer.
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: 1994 "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 sound 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. of this
Annex.
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 deicing.
Salt may alter the surface temporarily or even permanently in such a way as to
increase sound, and is therefore not recommended.

Noise - Mopeds. Proposed Supplement 3 to the 02 Series.