FprEN 1794-2

SLOVENSKI STANDARD
oSIST prEN 1794-2:2022
01-februar-2022
Protihrupne ovire za cestni promet - Neakustične lastnosti - 2. del: Metode
ugotavljanja splošnih značilnosti glede varnosti in varovanja okolja
Road traffic noise reducing devices - Non-acoustic performance - Part 2: Methods of
determination of the general safety and environmental characteristics
Lärmschutzvorrichtungen an Straßen - Nichtakustische Eigenschaften - Teil 2: Methoden
zur Bestimmung der allgemeinen Sicherheits- und Umwelteigenschaften
Dispositifs de réduction du bruit du trafic routier - Performances non acoustiques - Partie
2 : Méthodes de détermination des caractéristiques générales de sécurité et des
caractéristiques environnementales
Ta slovenski standard je istoveten z: prEN 1794-2
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
oSIST prEN 1794-2:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 1794-2:2022
oSIST prEN 1794-2:2022
DRAFT
EUROPEAN STANDARD
prEN 1794-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2021
ICS 93.080.30 Will supersede EN 1794-2:2020
English Version
Road traffic noise reducing devices - Non-acoustic
performance - Part 2: Methods of determination of the
general safety and environmental characteristics
Dispositifs de réduction du bruit du trafic routier - Lärmschutzvorrichtungen an Straßen - Nichtakustische
Performances non acoustiques - Partie 2 : Méthodes de Eigenschaften - Teil 2: Methoden zur Bestimmung der
détermination des caractéristiques générales de allgemeinen Sicherheits- und Umwelteigenschaften
sécurité et des caractéristiques environnementales
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-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.
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

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1794-2:2021 E
worldwide for CEN national Members.

oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
Contents Page
European foreword. 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and symbols . 5
3.1 Terms and definitions . 5
3.2 Symbols . 6
4 Characteristics . 7
4.1 Safety in case of brushwood fire . 7
4.2 Resistance to dynamic loads: risk of falling debris . 7
4.3 Environmental protection . 7
4.4 Access for maintenance and emergency exits . 7
4.5 Light reflection . 7
4.6 Transparency. 7
5 Test report . 7
Annex A (normative) Safety in case of brushwood fire . 8
Annex B (normative) Resistance to dynamic loads: risk of falling debris .10
Annex C (normative) Environmental protection .14
Annex D (normative) Access for maintenance and emergency exits .15
Annex E (normative) Light reflection .17
Annex F (informative) Transparency.19

oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
European foreword
This document (prEN 1794-2:2021) 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 document will supersede EN 1794-2:2020.
This document is part of a series that consists of the following parts under the general title “Road traffic
noise reducing devices — Non-acoustic performance”:
— Part 1: Methods of determination of the mechanical and stability characteristics
— Part 2: Methods of determination of the general safety and environmental characteristics
— Part 3: Reaction to fire – Burning behaviour of noise reducing devices and classification
The main change compared to the previous edition is:
— The Annexes A to F: the acceptance criteria given in the previous version of this standard have
been deleted and transferred to EN 14388:2021.
oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
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.
oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
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.
prEN 1794-1:2021, Road traffic noise reducing devices - Non-acoustic performance - Part 1: Mechanical
performance and stability requirements
EN ISO 2813:2014, Paints and varnishes - Determination of gloss value at 20°, 60° and 85° (ISO
2813:2014)
3 Terms, definitions and symbols
3.1 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 https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1.1
road traffic noise reducing device
RTNRD
device designed to reduce the propagation of traffic noise away from the road environment
Note 1 to entry: The NRD may comprise acoustic elements (3.1.2) only or both structural (3.1.3) and acoustic
elements.
Note 2 to entry: Applications of NRD include noise barriers (3.1.4), claddings(3.1.5), covers (3.1.6) and added
devices(3.1.7).
3.1.2
acoustic element
element whose primary function is to provide the acoustic characteristic of the device
3.1.3
structural element
element whose primary function is to support or hold in place acoustic elements
3.1.4
noise barrier
noise reducing device which obstructs the direct transmission of airborne sound emanating from road
traffic
oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
3.1.5
cladding
noise-reducing device which is attached to a wall or other structure and reduces the amount of sound
reflected
3.1.6
cover
noise-reducing device which either spans or overhangs the road
3.1.7
added device
additional component that influences the acoustic characteristic of the original noise-reducing device
Note 1 to entry: The added device is acting primarily on the diffracted energy.
3.2 Symbols
For the purposes of this document, the following symbols apply.
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 F.2) in degrees;
ϴ angle of incidence
α
angle of transparency (see Figure F.2) in degrees;
n
α angle (see Figure B.1)
ß angle of opacity (see Figure F.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 F.1) 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
L /100 coefficient
T
r radius (see Figure B.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
oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
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
4 Characteristics
4.1 Safety in case of brushwood fire
The safety in case of brushfire shall be determined in accordance with Annex A.
4.2 Resistance to dynamic loads: risk of falling debris
When secondary safety has to be determined, this shall be done in accordance with Annex B.
4.3 Environmental protection
The constituent materials and their breakdown products shall be identified in accordance with
Annex C.
4.4 Access for maintenance and emergency exits
The acoustic and mechanical performances of doors or other means of escape shall be determined in
accordance with Annex D.
4.5 Light reflection
The results of a standard test of reflectivity shall be determined in accordance with Annex E.
4.6 Transparency
The results of a standard test of transparency should be determined in accordance with Annex F.
5 Test report
Every test report on aspects of performance shall include the following information:
a) number and year of this document;
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, description of the sampling procedure, if the performance
is determined by parts of manufactured elements;
d) place and date of determination, and the name of the responsible person(s);
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.
oSIST prEN 1794-2:2022
prEN 1794-2:2021 (E)
Annex A
(normative)
Safety in case of brushwood fire
A.1 General
A road traffic noise reducing device can be exposed to fire arising from dry vegetation or other material
in close proximity. More severe fires from spilt fuel can arise as the result of traffic accidents.
Where a road traffic noise reducing device is in close proximity to property it can also be necessary to
consider the need to ensure that fire is not spread from the highway.
Where flammable systems are used, it is recommended that firebreaks of fire-resistant materials or
other design
...