EN 1794-2:2020

SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 1794-2:2011
Protihrupne ovire za cestni promet - Neakustične lastnosti - 2. del: Splošne
zahteve za varnost in varovanje okolja
Road traffic noise reducing devices - Non-acoustic performance - Part 2: General safety
and environmental requirements
Lärmschutzvorrichtungen an Straßen - Nichtakustische Eigenschaften - Teil 2:
Allgemeine Sicherheits- und Umweltanforderungen
Dispositifs de réduction du bruit du trafic routier - Performances non acoustiques - Partie
2 : Exigences générales pour la sécurité et l'environnement
Ta slovenski standard je istoveten z: EN 1794-2:2020
ICS:
13.020.99 Drugi standardi v zvezi z Other standards related to
varstvom okolja environmental protection
17.140.30 Emisija hrupa transportnih Noise emitted by means of
sredstev transport
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.

EN 1794-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2020
EUROPÄISCHE NORM
ICS 93.080.30 Supersedes EN 1794-2:2011
English Version
Road traffic noise reducing devices - Non-acoustic
performance - Part 2: General safety and environmental
requirements
Dispositifs de réduction du bruit du trafic routier - Lärmschutzvorrichtungen an Straßen - Nichtakustische
Performances non acoustiques - Partie 2: Exigences Eigenschaften - Teil 2: Allgemeine Sicherheits- und
générales pour la sécurité et l'environnement Umweltanforderungen
This European Standard was approved by CEN on 6 April 2020.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1794-2:2020 E
worldwide for CEN national Members.

Contents Page
European foreword. 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols . 6
5 Requirements . 7
5.1 Secondary safety (falling debris). 7
5.2 Environmental protection . 7
5.3 Means of escape in emergency . 7
5.4 Reflection of light . 7
5.5 Transparency. 7
6 Test report . 7
Annex A (normative) Secondary safety: danger of falling debris . 8
Annex B (normative) Environmental protection .12
Annex C (normative) Access for maintenance and emergency exits .13
Annex D (normative) Light reflection .15
Annex E (informative) Transparency .17
Bibliography .25

European foreword
This document (EN 1794-2:2020) has been prepared by Technical Committee CEN/TC 226 “Road
equipment”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2020, and conflicting national standards
shall be withdrawn at the latest by November 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1794-2:2011.
This series consists of the following parts under the general title “Road traffic noise reducing devices —
Non-acoustic performance”:
— Part 1: Mechanical performance and stability requirements
— Part 2: General safety and environmental requirements
— Part 3: Reaction to fire - Burning behaviour of noise reducing devices and classification
The main change compared to the previous edition is:
— the suppression of the Annex A, resistance to brushwood fire moved into EN 1794-3.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey
and the United Kingdom.
Introduction
While performing their primary function, road traffic noise reducing devices should not pose hazards
to road users or other people in the vicinity or to the environment at large. Noise reducing devices
should not reflect light in such a way as to prejudice road safety. They should be made from materials
which do not emit noxious fumes or leachates as the result of natural or industrial processes, or as the
result of fire. Noise reducing devices should allow a means of escape by road users and access by
operatives in the event of an emergency or for maintenance.
1 Scope
This document specifies methods and criteria for assessing the general safety and environmental
performance of road traffic noise reducing devices under typical roadside conditions. Appropriate test
methods are provided where these are necessary. The treatment of each topic is covered separately in
Annexes A to E.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
EN 1794-1:2018, Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical
performance and stability requirements
EN ISO 2813, Paints and varnishes - Determination of gloss value at 20°, 60° and 85° (ISO 2813)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
noise reducing device
NRD
system designed to reduce the propagation of traffic noise away from the road environment
Note 1 to entry: The NRD comprises acoustic elements only or both structural and acoustic elements.
Note 2 to entry: applications of NRD include noise barriers, claddings, covers and added devices.
3.2
noise barrier
noise reducing device which obstructs the direct transmission of airborne sound emanating from road
traffic
3.3
acoustic element
element whose primary function is to provide the acoustic performance of the device
3.4
structural element
element whose primary function is to support or hold in place acoustic elements
3.5
cladding
noise reducing device which is attached to a wall or other structure to reduce the amount of sound
reflected
3.6
cover
noise reducing device which either spans or overhangs the road
3.7
added device
additional component that influences the acoustic performance of the original noise-reducing device
(acting primarily on the diffracted energy)
4 Symbols
ϕ angle at which reflections from the surface of the transparent material obscure
m
the view through the material, in degrees;
ϕ angle between the visual axis and the normal to the noise reducing device (see
Figure E.2), in degrees;
ϴ angle of incidence
α angle of transparency (see Figure E.2), in degrees;
n
α angle (see Figure A.1)
ß angle of opacity (see Figure E.2), in degrees;
n
η angle of the transparent Elements
µ terms of refractive index
t function of the angle of incidence
θ
K visual acuity factor (see Figure E.3), in degrees;
A
k Parameter
L light transmission index (as determined in accordance with EN 410 or
T
EN 2155-5), in percent;
’
L overall transparency for different material thickness t’
T
LT/100 coefficient
r radius (see Figure A.1)
S area of opaque features within transparent elements, in square millimetres;
O
S total area of transparent elements, including horizontal features, in square
T
millimetres;
t/t’ material thickness/ different material thickness
T transparency, in percent;
T transparency looking right, in percent;
r
T transparency looking left, in percent;
l
T dynamic transparency, in percent;
D
T static transparency, in percent.
S
u estimated uncertainties
i
u sum of the estimated combined uncertainties
T
u the square of the uncertainty in T
T
w weights
i
5 Requirements
5.1 Secondary safety (falling debris)
When secondary safety has to be assessed, this shall be done in accordance with Annex A.
5.2 Environmental protection
The constituent materials and their breakdown products shall be identified in accordance with
Annex B.
5.3 Means of escape in emergency
The acoustic and mechanical performances of doors or other means of escape shall be assessed in
accordance with Annex C.
5.4 Reflection of light
The results of a standard test of reflectivity shall be assessed in accordance with Annex D.
5.5 Transparency
The results of a standard test of transparency should be assessed in accordance with Annex E.
6 Test report
6.1 Every test report on aspects of performance shall include the following information:
a) number and year of this European Standard;
b) full description of the element or system tested, including manufacturer(s), part numbers, place
and date of origin;
c) description of the method of sampling, if parts of manufactured elements are evaluated by testing;
d) place and date of assessment, and the name of the assessor;
e) sufficient description of any tests carried out, any results measured and the conclusions drawn
about the product together with any illustrations or photographs, all as specified in the
appropriate annex.
6.2 A summary report shall be produced, identifying the aspects of performance for which detailed
reports are available and the level of performance assessed, where appropriate.
Annex A
(normative)
Secondary safety: danger of falling debris
A.1 General
Noise reducing devices can be mounted on structures or in such a way that if damaged they could pose
a hazard to road users or to others. In particular, even if the noise reducing device is protected by the
safety system on an elevated structure, there is a possibility of pieces or whole panels from a noise
barrier becoming detached as the result of a violent collision and for the debris to fall, endangering
those below.
Noise reducing devices which are to be used in a vulnerable position may be required to be restrained
by internal or external linkage between panels and/or elements to prevent them from becoming
detached and falling.
The standard provides some general indications of factors which need to be considered and also
provides a method of establishing the resistance of a product to a severe blow.
NOTE
...