oSIST prEN 12899-6:2009
(Main)Fixed vertical road traffic signs - Part 6: Visual performance of retroreflective sheeting materials
Fixed vertical road traffic signs - Part 6: Visual performance of retroreflective sheeting materials
This standard specifies the visual performance for road users of retroreflective sheeting materials, as expressed by their retroreflection in vehicle headlamp illumination and their reflection and chromaticity in daylight.
Ortsfeste, vertikale Straßenverkehrszeichen - Teil 6: Visuelle Anforderungen an retroreflektierendes Beschichtungsmaterial
Diese Norm legt die visuellen Anforderungen der Verkehrsteilnehmer an retroreflektierende
Beschichtungsmaterialien fest. Die visuellen Anforderungen ergeben sich aus der Retroreflexion von Licht aus
Fahrzeugscheinwerfern sowie der Reflexion und dem Farbwert bei Tageslicht.
Signaux fixes de signalisation routière verticale - Partie 6 : Performances visuelles des matériaux de films rétroréfléchissants
La présente norme spécifie les performances visuelles des usagers de la route s'agissant des matériaux de films rétroréfléchissants, qui sont exprimées par leur rétroréflexion dans l'éclairage des phares du véhicule et leur réflexion et chromaticité de jour.
Stalna vertikalna cestna signalizacija - 6. del: Vizualne zahteve za retroreflektivni premazne materiale
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2009
Stalna vertikalna cestna signalizacija - 6. del: Vizualne zahteve za retroreflektivni
premazne materiale
Fixed vertical road traffic signs - Part 6: Visual performance of retroreflective sheeting
materials
Ortsfeste, vertikale Straßenverkehrszeichen - Teil 6: Visuelle Anforderungen an
retroreflektierendes Beschichtungsmaterial
Ta slovenski standard je istoveten z: prEN 12899-6
ICS:
93.080.30 Cestna oprema in pomožne Road equipment and
naprave installations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2008
ICS 93.080.30
English Version
Fixed vertical road traffic signs - Part 6: Visual performance of
retroreflective sheeting materials
Ortsfeste, vertikale Straßenverkehrszeichen - Teil 6:
Visuelle Anforderungen an retroreflektierendes
Beschichtungsmaterial
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 226.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12899-6:2008: E
worldwide for CEN national Members.
Contents
Foreword . 3
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
4 Retroreflection of retroreflective sheeting materials . 7
4.1 Introduction . 7
4.2 Derivation of the coefficient of retroreflection for signal and contrast colours . 8
4.3 Application classes for signal colours . 8
4.4 Performance classes for signal colours . 10
4.5 Derivation of the R index for secondary datum axes . 11
A
Requirements for contrast colours . 12
4.6 Requirements for contrast colours . 12
5 Daytime luminance factor and chromaticity of retroreflective sheeting materials . 12
Annex A (normative) Methods for deriving the coefficient of retroreflection R and its symmetries . 16
A
A.1 General . 16
A.2 Method for deriving R (αα,ββ) values by thorough testing . 16
ααββ
A,C
A.3 Method of deriving R (αααα,ββββ) values by simplified testing . 19
A,C
A.4 Establishment of datum axis reversal symmetry . 19
A.5 Establishment of datum axis rotation symmetry . 20
A.5.1 General . 20
A.5.2 Optical Elements with complete rotational symmetry . 20
A.5.3 Optical Elements without complete rotational symmetry . 20
Annex B (normative) Colorimetric testing . 21
B.1 Luminance factor and chromaticity of non-fluorescent materials . 21
B.1.1 General . 21
B.1.2 Reference method for microprismatic sheeting materials . 21
B.1.3 Secondary method for microprismatic sheeting materials . 21
B.2 Luminance factor and chromaticity of fluorescent materials . 22
Annex C (informative) Guidelines for the selection of application and performance classes . 23
C.1 Introduction . 23
C.2 Application classes . 23
C.3 Performance classes . 24
C.4 Vehicles other than the passenger car . 25
C.5 Signs at other locations . 26
C.6 Other factors . 27
C.7 Guidelines . 28
Bibliography . 31
Foreword
This document (prEN 12899-6:2008) has been prepared by Technical Committee CEN/TC 226 “Road equipment”,
the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This European Standard consists of the following Parts under the general title:
Fixed, vertical road traffic signs —
Part 1: Fixed signs
Part 2: Transilluminated traffic bollards (TTB)
Part 3: Delineator posts and retroreflectors
Part 4: Factory production control
Part 5: Initial type testing
Part 6: (This part) Visual performance of retroreflective sheeting materials
Annexes A and B are normative.
The visual performance of retroreflective sheeting materials is is dependent on the properties of retroreflection,
luminance factor and chromaticity. Retroreflection is the relevant characteristic for the legibility of road signs during
night time driving, while luminance factor and chromaticity are relevant characteristics for the legibility of signs during
the daytime (and for illuminated signs at night).
Test methods for retroreflection are provided in Annex A and for luminance factor and chromaticity in Annex B. These
Annexes are of a complex technical nature, as they deal with retroreflective sheeting materials of both known
technologies - glass beaded and microprismatic - and because the fluorescence of fluorescent sheeting materials has
been taken into account in Annex B. These Annexes are primarily intended to be studied by experts working at test
laboratories.
The requirements for retroreflection are provided in clause 4. A distinction is made between the situations in which a
road sign has to be read and the level of luminance to be expected from a sign with a particular sheeting material in
those situations. The situations are grouped into a number of application classes while the level of luminance is
described by means of an R index. A number of classes of convenience called performance classes are defined by
A
means of the R index.
A
This system of classes is intended as a tool for trading in the sense that the manufacturer of a retroreflective sheeting
material can supply adequate documentation of the performance of his product, which is to be used by the purchaser of
sheeting materials to select products that are suitable for particular purposes. The system of classes is complex - and
has to be complex - in order to make good use of retroreflection. A single material cannot supply optimum or even
adequate sign legibility in all applications, but some materials can do so in some applications and other materials in
other applications.
However, it is assumed that the purchaser has some guidance through national regulations or tender specifications that
define the application and performance classes for individual road signs or types or uses of road signs. Clause 4 is
therefore intended primarily for the manufacturers of retroreflective sheeting materials and for national legislators
perhaps assisted by specialists.
National regulations or tender specifications will reflect a national policy that may take several matters into account.
Annex C is intended to provide guidance for formulating such a policy.
The requirements for the luminance factor and the chromaticity of retroreflective materials are provided in clause 5.
These are formulated in a simple manner by means permissible values for the luminance factor and permissible
chromaticity boxes for the chromaticity.
Introduction
A legend or a symbol on a sign face is presented in one colour against the background of another colour. One of these
colours is generally brighter than the other and is called the signal colour, while the darker colour is called the contrast
colour; refer to 3.1 and 3.2.
Some bright colours serve generally as signal colours, while some dark colours generally serve as contrast colours. A
few colours may sometimes serve as signal and sometimes as contrast colours. The supplier of a sheeting material
may decide which colours he wants to offer as signal and/or contrast colours.
The signal colour is considered to be the more important in terms of retroreflective performance. This has implications
for the methods for deriving the coefficient of retroreflection R and for the requirements for retroreflection.
A
The methods for deriving the coefficient of retroreflection R are provided in Annex A. These methods are to be used
A
for all sheeting materials regardless of their technology and the results may differ from those obtained with other test
methods (for instance the simplified test method conventionally used for glass beaded sheeting materials).
The requirements for retroreflection are provided in clause 4. For signal colours, the requirements are expressed by
technical classes for application and performance. For contrast colours, the requirements are expressed by the
contrast to signal colours.
Some guidelines for the selection of application and performance classes are offered in the informative Annex C.
It is a particular feature of retroreflection that it has limitations. Consequently, application and performance classes
cannot in practice be selected independently of each other. Additionally, the application class which is the most
suitable for drivers of small vehicles may be less suitable for drivers of large vehicles.
Annex C is therefore intended as the basis for forming a policy for retroreflective road signs, in which conflicting
interests are weighed against each other in a suitable manner.
The daytime performance is described in a conventional manner by means of requirements for the luminance
factor and the chromaticity. The requirements are provided in clause 5 and the test methods in Annex B.
1 Scope
This standard specifies the visual performance for road users of retroreflective sheeting materials, as expressed by
their retroreflection in vehicle headlamp illumination and their reflection and chromaticity in
...
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