Regulation No. 3-02

Name:Regulation No. 3-02
Description:Reflectors.
Official Title:Uniform Provisions Concerning the Approval of: Retro-reflecting Devices for Power-driven Vehicles and their Trailers.
Country:ECE - United Nations
Date of Issue:1964-09-23
Amendment Level:02 Series, Supplement 16
Number of Pages:43
Vehicle Types:Agricultural Tractor, Bus, Car, Component, Heavy Truck, Light Truck, Motorcycle, Trailer
Subject Categories:Lighting and Light Signalling Equipment
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Keywords:

approval, retro-reflecting, annex, device, regulation, test, devices, type, class, amendments, series, surface, paragraph, angle, force, date, supplement, conformity, water, entry, requirements, illumination, number, granted, retro-reflectors, optical, sample, dust, tests, specifications, iva, iiib, resistance, retro-reflector, approved, illuminating, means, centre, measured, mark, production, lamps, units, procedure, photometric, minimum, cil, manufacturer, iiia, shape

Text Extract:

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E/ECE/324
) Add.2/Rev.4/Amend.2
E/ECE/TRANS/505 )
November 9, 2015
STATUS OF UNITED NATIONS REGULATION
ECE 3-02
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
RETRO-REFLECTING DEVICES FOR POWER-DRIVEN
VEHICLES AND THEIR TRAILERS
Incorporating:
Supplement 3 to the 02 series of amendments
Date of Entry into Force: 15.02.96
Supplement 4 to the 02 series of amendments
Date of Entry into Force: 18.01.98
Supplement 5 to the 02 series of amendments
Date of Entry into Force: 05.06.98
Corr. 1 to Supplement 5 to the 02 series of amendments
Dated: 08.11.00
Supplement 6 to the 02 series of amendments
Date of Entry into Force: 11.08.02
Supplement 7 to the 02 series of amendments
Date of Entry into Force: 16.07.03
Corr. 1 to Supplement 6 to the 02 series of amendments
Dated: 12.11.03
Supplement 8 to the 02 series of amendments
Date of Entry into Force: 12.08.04
Supplement 9 to the 02 series of amendments
Date of Entry into Force: 13.11.04
Supplement 10 to the 02 series of amendments
Date of Entry into Force: 02.02.07
Supplement 11 to the 02 series of amendments
Date of Entry into Force: 24.10.09
Supplement 12 to the 02 series of amendments
Date of Entry into Force: 23.06.11
Supplement 13 to the 02 series of amendments
Date of Entry into Force: 15.07.13
Supplement 13 to the 02 series of amendments
Date of Entry into Force: 15.07.13
Supplement 14 to the 02 series of amendments
Date of Entry into Force: 03.11.13
Supplement 15 to the 02 series of amendments
Date of Entry into Force: 09.10.14
Supplement 16 to the 02 series of amendments
Date of Entry into Force: 08.10.15

REGULATION No. 3
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF RETRO-REFLECTING
DEVICES FOR POWER-DRIVEN VEHICLES AND THEIR TRAILERS
CONTENTS
REGULATION
1.
Scope
2.
Definitions
3.
Application for Approval
4.
Markings
5.
Approval
6.
General Specifications
7.
Special Specifications (Tests)
8.
Conformity of Production
9.
Penalties for Non-conformity of Production
10.
Production Definitely Discontinued
11.
Names and Addresses of Technical Services Responsible for Conducting Approval Tests, and
of Type Approval Authorities
12.
Transitional Provisions
ANNEXES
Annex 1 − Retro-Reflecting Devices, Symbols, Units
Annex 2 − Communication
Annex 3 − Examples of Approval Marks
Annex 4 − Test Procedure − Class IA and Class IIIA
Annex 5 − Specifications of Shape and Dimensions
Appendix − Retro-reflectors for Trailers − Classes IIIA and IIIB
Annex 6 − Colorimetric Specifications
Annex 7 − Photometric Specifications
Annex 8 − Resistance to External Agents
Annex 9 − Stability in Time of Optical Properties of Retro-Reflecting Devices
Annex 10 − Resistance to Heat
Annex 11 − Colour Fastness
Annex 12 − Chronological Order of Tests
Annex 13 − Resistance to Impact − Class IVA
Annex 14 − Test Procedure − Class IVA
Annex 15 − Chronological Order of Tests for Class IVA
Annex 16 − Test Procedure for Classes IB and IIIB Devices
Annex 17 − Minimum Requirements for Conformity of Production Control Procedures
Annex 18 − Minimum Requirements for Sampling by an Inspector

2.12. A type of "retro-reflecting device" is defined by the models and descriptive literature submitted
with the application for approval. Retro-reflecting devices can be considered as belonging to
the same type if they have one or more "retro-reflecting optical units" which are identical with
those of the standard model, or if not identical are symmetrical and suitable for mounting one
on the left and one on the right side of the vehicle, and if their other parts differ from those of
the standard model only in ways not affecting the properties to which this Regulation applies.
2.13. Retro-reflecting devices are divided into three classes according to their photometric
characteristics: Class IA or IB, Class IIIA or IIIB, and Class IVA.
2.14. Retro-reflecting devices of Class IB and IIIB are devices combined with other signal lamps
which are not watertight according to Annex 8, Paragraph 1.1., and which are integrated into
the body of a vehicle.
2.15. "Colour of the reflected light of the device" The definitions of the colour of the reflected
light are given in Paragraph 2.30 of Regulation No. 48.
3. APPLICATION FOR APPROVAL
3.1. The application for approval shall be submitted by the holder of the trade name or mark, or if
necessary by his duly accredited representative.
At the choice of the applicant, it will specify that the device may be installed on a vehicle with
different inclinations of the reference axis in respect to the vehicle reference planes and to the
ground or, in the case of Class IA, IB and IVA retro-reflectors, rotate around its reference axis;
these different conditions of installation shall be indicated in the communication form. It shall
be accompanied by:
3.1.1. Drawings, in triplicate, in sufficient detail to permit identification of the type, showing
geometrically the position(s) in which the retro-reflecting device may be fitted to the vehicle,
and in case of Class IB or IIIB retro-reflectors details of installation. The drawings must show
the position intended for the approval number and class indicator in relation to the circle of the
approval mark;
3.1.2. A brief description giving the technical specifications of the materials of which the
retro-reflecting optical unit is made;
3.1.3. Samples of the retro-reflecting device of a colour specified by the manufacturer; and if
necessary, the means of fixation; the number of samples to be submitted is specified in
Annex 4 to this Regulation;
3.1.4. If necessary, two samples in other colour(s) for simultaneous or subsequent extension of the
approval to devices in other colour(s);
3.1.5. In the case of devices of Class IVA: samples of the retro-reflecting device and, if necessary,
the means of fixation; the number of samples to be submitted is specified in Annex 14 to this
Regulation.

5.5.1. An international approval mark consisting of:
5.5.1.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country which
has granted approval;
5.5.1.2. An approval number;
5.5.1.3. A group of Symbols IA, IB, IIIA, IIIB or IVA showing the class of the approved retro-reflecting
device.
5.6. When two or more lamps are part of the same unit of grouped, combined or reciprocally
incorporated lamps (including a retro-reflector), approval is granted only if each of these
lamps satisfies the requirements of this Regulation or of another Regulation. Lamps not
satisfying any one of those Regulations shall not be part of such a unit of grouped, combined
or reciprocally incorporated lamps.
5.6.1. Where grouped, combined or reciprocally incorporated lamps comply with the requirements of
several Regulations, a single international approval mark may be applied, consisting of a
circle surrounding the Letter "E" followed by the distinguishing number of the country which
has granted the approval, an approval number and, if necessary, the required arrow. This
approval mark may be placed anywhere on the grouped, combined or reciprocally
incorporated lamps provided that:
5.6.1.1. It is visible after their installation;
5.6.1.2. No part of the grouped, combined or reciprocally incorporated lamps that transmits light can
be removed without at the same time removing the approval mark.
5.6.2. The identification symbol for each lamp appropriate to each Regulation under which approval
has been granted, together with the corresponding series of amendments incorporating the
most recent major technical amendments to the Regulation at the time of issue of the
approval, shall be marked:
5.6.2.1. Either on the appropriate light-emitting surface,
5.6.2.2. Or in a group, in such a way that each lamp of the grouped, combined or reciprocally
incorporated lamps may be clearly identified (see three possible examples shown in
Annex 3).

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. Retro-reflectors approved under this Regulation shall be so manufactured as to conform to
the type approved by meeting the requirements set forth in Paragraphs 6. and 7. above.
8.2. The minimum requirements for conformity of production control procedures set forth in
Annex 17 to this Regulation shall be complied with.
8.3. The minimum requirements for sampling by an inspector set forth in Annex 18 to this
Regulation shall be complied with.
8.4. The Type Approval Authority which has granted type approval may at any time verify the
conformity control methods applied in each production facility. The normal frequency of these
verifications shall be once every two years.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted for a type of retro-reflecting device may be withdrawn if the
requirements are not complied with or if a retro-reflecting device bearing the approval mark
does not conform to the type approved.
9.2. If a Contracting Party to the Agreement applying 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 2 to this
Regulation.
10. PRODUCTION DEFINITELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of retro-reflecting
device approved in accordance with this Regulation, he shall so inform the Type Approval
Authority which granted the approval. Upon receiving the relevant communication, that
Authority shall inform thereof the other Parties to the 1958 Agreement applying this
Regulation by means of a communication form conforming to the model in Annex 2 to this
Regulation.
11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Contracting Parties to the Agreement applying 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 Type Approval Authorities which grant approval and
to which forms certifying approval or extension or refusal or withdrawal of approval, issued in
other countries, are to be sent.

ANNEX 1
RETRO-REFLECTING DEVICES
SYMBOLS AND UNITS
A
=
Area of the illuminating surface of the retro-reflecting device (cm )
C
=
Centre of reference
NC
=
Axis of reference
Rr
=
Receiver, observer or measuring device
Cr
=
Centre of receiver
Ør
=
Diameter of receiver Rr if circular (cm)
Se
=
Source of illumination
Cs
=
Centre of source of illumination
Øs
=
Diameter of source of illumination (cm)
De
=
Distance from centre Cs to centre C (m)
D'e
=
Distance from centre Cr to centre C (m)
Note:
In general, De and D'e are very nearly the same and under normal conditions of observation it
may be assumed that De = D'e.
D
=
Observation distance from and from beyond which the illuminating surface appears to be
continuous
α = Angle of divergence
β
=
Illumination angle. With respect to the line CsC which is always considered to be horizontal,
this angle is prefixed by the signs - (left), + (right), + (up) or - (down), according to the position
of the source Se in relation to the axis NC, as seen when looking towards the retro-reflecting
device. For any direction defined by two angles, vertical and horizontal, the vertical angle is
always given first.
γ = Angular diameter of the measuring device Rr as seen from Point C
δ = Angular diameter of the source Se as seen from Point C
ε
=
Angle of rotation. This angle is positive when the rotation is clockwise as seen when looking
towards the illuminating surface. If the retro-reflecting device is marked "TOP", the position
thus indicated is taken as the origin.
E = Illumination of the retro-reflecting device (lux)
CIL
=
Coefficient of luminous intensity (millicandelas/lux)
Angles are expressed in degrees and minutes.

ANNEX 2
COMMUNICATION
(Maximum format: A4 (210 x 297mm))
issued by:
Name of administration:
.....................................
.....................................
.....................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITELY DISCONTINUED
of a type of retro-reflecting device pursuant to Regulation No. 3
Approval No. ............................................. Extension No. ..................................................
1. Trade name or mark of the device: ....................................................................................................
2. Manufacturer's name for the type of device: .....................................................................................
3. Manufacturer's name and address: ...................................................................................................
4. If applicable, name and address of the manufacturer's representative: ............................................
5. Submitted for approval on: .................................................................................................................
6. Technical service responsible for conducting approval tests: ...........................................................
7. Date of test report: .............................................................................................................................
8. Number of test report: ........................................................................................................................

ANNEX 3
EXAMPLES OF APPROVAL MARKS
Figure 1
Marking for single lamps
Model A
Model B

Figure 2
Simplified marking for grouped, combined or reciprocally incorporated lamps
Model D
Model E
Model F

ANNEX 4
TEST PROCEDURE CLASS IA AND CLASS IIIA
1. The applicant shall submit for approval ten samples which shall be tested in the chronological
order indicated in Annex 12.
2. After verification of the general specifications (Paragraph 6 of the Regulation) and the
specifications of shape and dimensions (Annex 5), the ten samples shall be subjected to the
heat resistance test described in Annex 10 to this Regulation and at least one hour after this
test examined as to their colorimetric characteristics and CIL (Annex 7) for an angle of
divergence of 20' and an illumination angle V = H = 0° or if necessary, in the position defined
in Annex 7, Paragraphs 4 and 4.1. The two retro-reflecting devices giving the minimum and
maximum values shall then be fully tested as shown in Annex 7. These two samples shall be
kept by the laboratories for any further checks which may be found necessary. The other
eight samples shall be divided into four groups of two:
First Group:
Second Group:
Third Group:
The two samples shall be subjected successively to the water penetration
test (Annex 8, Paragraph 1.1.) and then, if this test is satisfactory, to the
tests for resistance to fuels and lubricants (Annex 8, Paragraphs 3 and 4).
The two samples shall, if necessary, be subjected to the corrosion test
(Annex 8, Paragraph 2), and then to the abrasive-strength test of the rear
face of the retro-reflecting device (Annex 8, Paragraph 5).
The two samples shall be subjected to the test for stability in time of the
optical properties of retro-reflecting device (Annex 9).
Fourth Group: The two samples shall be subjected to the colour-fastness test (Annex 11).
3. After undergoing the tests referred to in the above Paragraph, the retro-reflecting devices in
each group must have:
3.1. A colour which satisfies the conditions laid down in Annex 6. This shall be verified by a
qualitative method and, in case of doubt, confirmed by a quantitative method.
3.2. A CIL which satisfies the conditions laid down in Annex 7. The verification shall be performed
only for an angle of divergence of 20' and an illumination angle of V = H = 0° or, if necessary,
in the position specified in Annex 7, Paragraphs 4 and 4.1.

ANNEX 5 – APPENDIX
RETRO-REFLECTORS FOR TRAILERS - CLASSES IIIA AND IIIB
150mm ≤
A≤
B≥
C≤
200mm
A
5
15mm
Note:
These sketches are for illustration purposes only.

ANNEX 7
PHOTOMETRIC SPECIFICATIONS
1. When applying for approval, the applicant shall specify one or more or a range of axis of
reference, corresponding to the illumination angle V = H = 0° in the table of coefficients of
luminous intensity (CIL).
In the case where more than one or a range of different axis of reference are specified by the
manufacturer, the photometric measurements shall be repeated making reference each time
to a different axis of reference or to the extreme axis of reference of the range specified by
the manufacturer.
2. For photometric measurements, only the illuminating surface defined by the planes
contiguous to the outermost parts of the optical system of the retro-reflecting device as
indicated by the manufacturer and contained within a circle of 200mm diameter for Class IA or
IB shall be considered, and the illuminating surface itself shall be limited to 100cm though
the surfaces of the retro-reflecting optical units need not necessarily attain this area. The
manufacturer shall specify the perimeter of the area to be used. In the case of Class IIIA,
Class IIIB and IVA the whole of the illuminating surfaces shall be considered without limitation
as to size.
3. The CIL values
3.1. Class IA, Class IB, Class IIIA and Class IIIB
3.1.1. The CIL values for red retro-reflecting devices must be at least equal to those in the table
below, expressed in millicandelas per lux, for the angles of divergence and illumination
shown.
CLASS
ANGLE
OF DIVERGENCE
α
IA, IB 20'
1°30'
IIIA, IIIB 20'
1°30'
ILLUMINATION ANGLES (IN DEGREES)
Vertical V
Horizontal H


300
5
450
12
±10°

200
2.8
200
8
±5°
±20°
100
2.5
150
8
CIL values lower than those shown in the last two columns of the above table are not
permissible within the solid angle having the reference centre as its apex and bounded by the
planes intersecting along the following lines:
(V = ± 10°, H = 0°) (V = ± 5°, H = ± 20°).
3.1.2. CIL values for amber retro-reflecting devices in Class IA or IB must be at least equal to those
in the table of Paragraph 3.1.1. above multiplied by the coefficient 2.5;
3.1.3. CIL values for colourless retro-reflecting devices in Class IA or IB must be at least equal to
those in the table of Paragraph 3.1.1. above multiplied by the coefficient 4.

ANNEX 8
RESISTANCE TO EXTERNAL AGENTS
1. RESISTANCE TO WATER AND DIRT PENETRATION
1.1. Water Submersion Test
1.1.1. Retro-reflecting devices whether part of a lamp or not, shall be stripped of all removable parts
and immersed for 10min in water at a temperature of 50 ± 5°C, the highest point of the upper
part of the illuminating surface being 20mm below the surface of the water. This test shall be
repeated after turning the retro-reflecting device through 180°, so that the illuminating surface
is at the bottom and the rear face is covered by about 20mm of water. These optical units
shall then be immediately immersed in the same conditions in water at a temperature of
25 ± 5°C.
1.1.2. No water shall penetrate to the reflecting surface of the retro-reflecting optical unit. If visual
inspection clearly reveals the presence of water, the device shall not be considered to have
passed the test.
1.1.3. If visual inspection does not reveal the presence of water or in case of doubt, the CIL shall be
measured by the method described in Annex 4, Paragraph 3.2., or Annex 14, Paragraph 4.2.,
the retro-reflecting device being first lightly shaken to remove excess water from the outside.
1.2. Alternative Test Procedure for Class IB and IIIB Devices
As an alternative, at the request of the manufacturer, the following test (moisture and dust
test) shall be applied instead of the submersion-test specified in Paragraph 1.1. above.
1.2.1. Moisture Test
The test evaluates the ability of the sample device to resist moisture penetration from a water
spray and determines the drainage capability of those devices with drain holes or other
exposed openings in the device.
1.2.1.1. Water Spray Test Equipment
1.2.1.1.1. Cabinet
A water spray cabinet with the following characteristics shall be used:
The cabinet shall be equipped with a nozzle(s) which provides a solid cone water spray of
sufficient angle to completely cover the sample device. The centreline of the nozzle(s) shall
be directed downward at an angle of 45° ± 5° to the vertical axis of a rotating test platform.
1.2.1.1.2. Rotating Test Platform
The rotating test platform shall have a minimum diameter of 140mm and rotate about a
vertical axis in the centre of the cabinet.

1.2.2.1.1. Dust Exposure Test Chamber
1.2.2.1.2. The Dust
The interior of the test chamber shall be cubical in shape in size 0.9 to 1.5m per side. The
bottom may be "hopper shaped" to aid in collecting the dust. The internal chamber volume,
not including a "hopper shaped" bottom shall be 2m maximum and shall be charged with 3 to
5kg of the test dust. The chamber shall have the capability of agitating the test dust by means
of compressed air or blower fans in such a way that the dust is diffused throughout the
chamber.
The test dust used shall be fine powdered cement in accordance with Standard
ASTM C 150-84.
1.2.2.2. Dust Exposure Test Procedure
A sample device, mounted on a test fixture, with the initial CIL measured and recorded, shall
be exposed to dust as follows:
1.2.2.2.1. Device Openings
All drain holes and other openings shall remain open. Drain wicks, when used, shall be tested
in the device.
1.2.2.2.2. Dust Exposure
The mounted device shall be placed in the dust chamber no closer than 150mm from a
wall. Devices with a length exceeding 600mm shall be horizontally centred in the test
chamber. The test dust shall be agitated as completely as possible by compressed air or
blower(s) at intervals of 15min for a period of 2 to 15s for the duration of 5h. The dust shall be
allowed to settle between the agitation periods.
1.2.2.2.3. Measured Sample Evaluation
Upon completion of the dust exposure test, the exterior of the device shall be cleaned and
dried with a dry cotton cloth and the CIL measured according to the method specified in
Annex 4, Paragraph 3.2.
2. RESISTANCE TO CORROSION
2.1. Retro-reflecting devices must be so designed that they retain the prescribed photometric and
colorimetric characteristics despite the humidity and corrosive influences to which they are
normally exposed. The resistance of the front surface to tarnishing and of the protection of the
rear face to deterioration shall be checked, particularly when an essential metal component
seems liable to be attacked.
2.2. The retro-reflecting device, or the lamp if the device is combined with a light, shall be stripped
of all removable parts and subjected to the action of a saline mist for a period of 50h,
comprising 2 periods of exposure of 24h each, separated by an interval of 2h during which the
sample is allowed to dry.

ANNEX 9
STABILITY IN TIME OF THE OPTICAL PROPERTIES
OF RETRO-REFLECTING DEVICES
1. The Type Approval Authority which granted approval shall have the right to check the stability
in time of the optical properties of a type of retro-reflecting device in service.
2. The competent authorities of countries other than the country in which approval was granted
may carry out similar checks in their territory. If a type of retro-reflector in use exhibits a
systematic defect, the said authorities shall transmit any components removed for
examination to the Type Approval Authority which granted approval, with a request for its
opinion.
3. In the absence of other criteria, the concept of "systematic defect" of a type of retro-reflector
in use shall be interpreted in conformity with the intention of Paragraph 6.1. of this Regulation.

ANNEX 11
COLOUR-FASTNESS
1. The Type Approval Authority which granted approval shall have the right to check the
colour-fastness of a type of retro-reflecting device in service.
2. The competent authorities of countries other than the country in which approval was granted
may carry out similar checks in their territory. If a type of retro-reflector in use exhibits a
systematic defect, the said authorities shall transmit any components removed for
examination to the Type Approval Authority which granted approval, with a request for its
opinion.
3. In the absence of other criteria, the concept "systematic defect" of a type of retro-reflector in
use shall be interpreted in conformity with the intention of Paragraph 9.1. of this Regulation.

ANNEX 13
RESISTANCE TO IMPACT - CLASS IVA
1. The retro-reflecting device shall be mounted in a manner similar to the way in which it is
mounted on the vehicle, but with the lens faced horizontal and directed upwards.
2. Drop a 13mm diameter polished solid steel ball, once, vertically onto the central part of the
lens from a height of 0.76m. The ball may be guided but not restricted in free fall.
3. When a retro-reflecting device is tested at room temperature with this method, the lens shall
not crack.

ANNEX 15
CHRONOLOGICAL ORDER OF TESTS FOR CLASS IVA

ANNEX 17
MINIMUM REQUIREMENTS FOR CONFORMITY OF
PRODUCTION CONTROL PROCEDURES
1. GENERAL
1.1. The conformity requirements shall be considered satisfied from a mechanical and geometric
standpoint, if the differences do not exceed inevitable manufacturing deviations within the
requirements of this Regulation.
1.2. With respect to photometric performances, the conformity of mass-produced retro-reflectors
shall not be contested if, when testing photometric performances of any retro-reflector chosen
at random no measured value deviates unfavourably by more than 20% from the minimum
values prescribed in this Regulation.
1.3. The chromaticity co-ordinates shall be complied with.
2. MINIMUM REQUIREMENTS FOR VERIFICATION OF CONFORMITY BY THE
MANUFACTURER
For each type of retro-reflector the holder of the approval mark shall carry out at least the
following tests, at appropriate intervals. The tests shall be carried out in accordance with the
provisions of this Regulation.
If any sampling shows non-conformity with regard to the type of test concerned, further
samples shall be taken and tested. The manufacturer shall take steps to ensure the
conformity of the production concerned.
2.1. Nature of Tests
Tests of conformity in this Regulation shall cover the photometric and colorimetric
characteristics and the resistance to penetration of water.
2.2. Methods Used in Tests
2.2.1. Tests shall generally be carried out in accordance with the methods set out in this Regulation.
2.2.2. In any test of conformity carried out by the manufacturer, equivalent methods may be used
with the consent of the Type Approval Authority. The manufacturer is responsible for proving
that the applied methods are equivalent to those laid down in this Regulation.
2.2.3. The application of Paragraphs 2.2.1. and 2.2.2. requires regular calibration of test apparatus
and its correlation with measurements made by a competent authority.
2.2.4. In all cases the reference methods shall be those of this Regulation, particularly for the
purpose of administrative verification and sampling.

ANNEX 18
MINIMUM REQUIREMENTS FOR SAMPLING BY AN INSPECTOR
1. GENERAL
1.1. The conformity requirements shall be considered satisfied from a mechanical and a geometric
standpoint, in accordance with the requirements of this Regulation, if any, if the differences do
not exceed inevitable manufacturing deviations.
1.2. With respect to photometric performance, the conformity of mass-produced retro-reflectors
shall not be contested if, when testing photometric performances of any retro-reflector chosen
at random:
1.2.1. No measured value deviates unfavourably by more than 20% from the minimum values
prescribed in this Regulation.
1.2.2. Retro-reflectors with apparent defects are disregarded.
1.3. The chromaticity co-ordinates shall be complied with.
2. FIRST SAMPLING
In the first sampling four retro-reflectors are selected at random. The first sample of two is
marked A, the second sample of two is marked B.
2.1. The Conformity is not Contested
2.1.1. Following the sampling procedure shown in Figure 1 of this Annex the conformity of
mass-produced retro-reflectors shall not be contested if the deviation of the measured values
of the retro-reflectors in the unfavourable directions are:
2.1.1.1. Sample A
2.1.1.2. Sample B
A1:
one retro-reflector
0%
one retro-reflector not more than
20%
A2:
both retro-reflectors more than
0%
but not more than
20%
go to Sample B
B1: both retro-reflectors 0%
2.2. The Conformity is Contested
2.2.1. Following the sampling procedure shown in Figure 1 of this Annex the conformity of
mass-produced retro-reflectors shall be contested and the manufacturer requested to make
his production meet the requirements (alignment) if the deviations of the measured values of
the retro-reflectors are:

3.1. The Conformity is not Contested
3.1.1. Following the sampling procedure shown in Figure 1 of this Annex the conformity of
mass-produced retro-reflectors shall not be contested if the deviations of the measured
values of the retro-reflectors are:
3.1.1.1. Sample C
3.1.1.2. Sample D
C1:
one retro-reflector
0%
one retro-reflector not more than
20%
C2:
both retro-reflectors more than
0%
but not more than
20%
go to Sample D
D1: in the case of C2
both retro-reflectors 0%
3.2. The Conformity is Contested
3.2.1. Following the sampling procedure shown in Figure 1 of this Annex the conformity of
mass-produced retro-reflectors shall be contested and the manufacturer requested to make
his production meet the requirements (alignment) if the deviations of the measured values of
the retro-reflectors are:
3.2.1.1. Sample D
D2:
in the case of C2
one retro-reflector more than
0%
but not more than
20%
one retro-reflector not more than
20%
3.3. Approval Withdrawn
3.3.1. Sample C
3.3.2. Sample D
Conformity shall be contested and Paragraph 9 applied if, following the sampling procedure in
Figure 1 of this Annex, the deviations of the measured values of the retro-reflectors are:
C3:
one retro-reflector not more than
20%
one retro-reflector more than
20%
C4: both retro-reflectors more than 20%
D3:
in the case of C2
one retro-reflector 0 or more than
0%
one retro-reflector more than
20%

Figure 1
Reflectors.