CEN/TC 226/WG 6 - Noise reducing devices

This document specifies a method for evaluating the working life of noise reducing devices used alongside roads according to the relevant exposure conditions.
It also specifies a method for determining the acoustic characteristic at the end of the working life.

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.

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.

This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided in order to take into account the wide diversity of practice in Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to noise reducing devices are covered in EN 1794-2.
This European Standard covers the current behaviour of the product. In order to assess its long term performances, EN 14389-2 should be used.
NOTE   The test procedure described in Annex A doesn't consider the fatigue effect.

This document specifies the laboratory method for measuring the airborne sound insulation performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4.
This method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed on roads in non-reverberant conditions.

TC - Modification to Formula (4) in all three language versions.

This European Standard specifies the laboratory method for measuring the sound absorption performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic sound absorption performance of devices that can reasonably be assembled inside the testing facility described in EN ISO 354.
This method is not intended for the determination of the intrinsic characteristics of sound absorption of noise reducing devices to be installed on roads in non-reverberant conditions.
The test method in EN ISO 354 referred to in this European Standard excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases, care is needed in interpreting the results.

This European Standard specifies requirements for the following road traffic noise reducing devices (as defined in 3.1):
-   noise barriers (as defined in 3.2);
-   claddings (as defined in 3.5);
-   road covers (as defined in 3.6); and
-   added devices (as defined in 3.7).
These devices may include both acoustic and structural elements, where:
-   an acoustic element is an element whose primary function is to provide a noise reducing device with sound insulation, diffraction and/or sound absorption, it is a part of noise reducing device to be used along roads, and
-   a structural element is an element whose primary function is to support or hold in place acoustic elements, it is a part of noise reducing device to be used along roads. Depending upon the design of the noise reducing device, structural elements may potentially be tested separately from acoustic elements.
They may be made of different materials for which specific standards are to be applied in accordance with the specifications prescribed hereafter. Some of the materials may contain dangerous substances, the reason why all the materials are declared.
This European Standard identifies the relevant characteristics of road traffic noise reducing devices, the corresponding methods of evaluation and specifies the provisions on evaluation of conformity and marking.
This European Standard covers acoustic, non-acoustic and long term performance, but not aspects such as resistance to vandalism or requirements of visual appearance.
This European Standard does not cover road surfaces or the airborne sound insulation of houses.

This European Standard is to give authorities, designers and specifiers information with respect to reaction to fire, smoke density and toxic fumes of materials used in noise reducing devices.
The combination of brushwood fire test, smoke density test and test for toxic fumes give in general enough safety information. This European Standard gives also information if more stringent requirements are requested for situations with a higher level of safety.
For noise reducing devices, this European Standard gives a method how to handle substantial components of non-homogeneous products (as defined in EN 13501-1 and ISO/DIS 5659-2:2016) and how to handle non-homogeneous products and in which cases the influence of non-substantial components on the total result of the classification may be neglected.
The following effects will be taken into account: ignitability, burning droplets, smoke growth rate, smoke density, toxic fumes.
The European Commission Decision 96/603/EC establish the list of products belonging to Classes A ‘No contribution to fire ’. The materials, and products made from them, that are listed in the Annex to this Decision, will, on account of their low level of combustibility and subject to the conditions also set out in the Annex, be classified in Classes A1 and Class A1FL as provided for in Tables 1 and 2 of the Annex to Decision 2000/147/EC. For the purpose of this classification, no reaction-to-fire testing of those materials and products made from them is required. The products considered having no contribution to fire are excluded from this standard.

This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from road noise reducing devices: the reflection index.
The test method is intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed along roads, to be measured either on typical installations alongside roads or on a relevant sample section;
- determination of the in situ intrinsic characteristics of sound reflection of noise reducing devices in actual use;
- comparison of design specifications with actual performance data after the completion of the construction work;
- verification of the long-term performance of noise reducing devices (with a repeated application of the method).
The test method is not intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in a restricted frequency range and the reasons of the restriction(s) shall be clearly reported.

This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method described gives the acoustic benefit over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions).
The test method is intended for the following applications:
•   preliminary qualification, outdoors or indoors, of added devices to be installed on noise reducing devices;
•   determination of sound diffraction index difference of added devices in actual use;
•   comparison of design specifications with actual performance data after the completion of the construction work;
•   verification of the long term performance of added devices (with a repeated application of the method);
•   interactive design process of new products, including the formulation of installation manuals.
The test method can be applied both in situ and on samples purposely built to be tested using the method described here.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons of the restriction(s) shall be clearly reported. A single-number rating is calculated from frequency data.
For indoors measurements see Annex A.

This part of prEN 1793 gives a normalized traffic noise spectrum for the evaluation and assessment of the acoustic performance of devices designed to reduce traffic noise near roads.

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.

This document specifies criteria to categorize road traffic noise reducing devices according to basic mechanical characteristics under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided in order to take into account the wide diversity of practice in Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to road noise reducing devices are covered in FprEN 1794-2.
This document covers the current behaviour of the product. For the assessment of its long-term characteristics, EN 14389-2 is applicable.
NOTE   The test procedure described in Annex A does not consider the fatigue effect.

This document provides Product Category Rules (PCR) for the declaration of the Sustainability of RTNRDs according to EN 15804:2012+A2:2019.

This document specifies the laboratory method for measuring the airborne sound insulation performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4.
This method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed on roads in non-reverberant conditions.

This European Standard specifies the laboratory method for measuring the sound absorption performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic sound absorption performance of devices that can reasonably be assembled inside the testing facility described in EN ISO 354.
This method is not intended for the determination of the intrinsic characteristics of sound absorption of noise reducing devices to be installed on roads in non-reverberant conditions.
The test method in EN ISO 354 referred to in this European Standard excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases, care is needed in interpreting the results.

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.

This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of sound reflection from road noise reducing devices: the reflection index.
The test method is intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed along roads, to be measured either on typical installations alongside roads or on a relevant sample section;
- determination of the in situ intrinsic characteristics of sound reflection of noise reducing devices in actual use;
- comparison of design specifications with actual performance data after the completion of the construction work;
- verification of the long-term performance of noise reducing devices (with a repeated application of the method).
The test method is not intended for the following applications:
- determination of the intrinsic characteristics of sound reflection of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in a restricted frequency range and the reasons of the restriction(s) shall be clearly reported.

This European Standard describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height (the method described gives the acoustic benefit over a simple barrier of the same height; however, in practice the added device can raise the height and this could provide additional screening depending on the source and receiver positions).
The test method is intended for the following applications:
•   preliminary qualification, outdoors or indoors, of added devices to be installed on noise reducing devices;
•   determination of sound diffraction index difference of added devices in actual use;
•   comparison of design specifications with actual performance data after the completion of the construction work;
•   verification of the long term performance of added devices (with a repeated application of the method);
•   interactive design process of new products, including the formulation of installation manuals.
The test method can be applied both in situ and on samples purposely built to be tested using the method described here.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results shall be given in the restricted frequency range and the reasons of the restriction(s) shall be clearly reported. A single-number rating is calculated from frequency data.
For indoors measurements see Annex A.

This part of prEN 1793 gives a normalized traffic noise spectrum for the evaluation and assessment of the acoustic performance of devices designed to reduce traffic noise near roads.

This document specifies product characteristics for road traffic noise reducing devices (RTNRD) - as defined in 3.1 - to be used alongside roads to reduce the propagation of traffic noise away from the road environment.
The following types of road traffic noise reducing devices are covered by this document:
-   noise barriers (as defined in 3.4);
-   claddings (as defined in 3.5);
-   covers (as defined in 3.6); and
-   added devices (as defined in 3.7).
Road traffic noise reducing devices comprise acoustic elements (as defined in 3.2), structural elements (as defined in 3.3) or self-supporting elements (having both acoustic and structural functions).
This document identifies assessment and verification of constancy of performance (AVCP) of characteristics of road traffic noise reducing devices.
This document does not cover the following:
-   resistance of RTNRD to vandalism,
-   visual appearance of RTNRD, and
   acoustic properties of road pavements.

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.

This European Standard specifies the Key Performance Indicators (KPIs) to facilitate a tangible appreciation of the degree by which an NRD can be considered sustainable. It focuses on four key sustainability sets of factors;
(i) technical,
(ii) environmental,
(iii) economic
(iv) and social.
NRD manufacturers are required to declare the data available against a series of defined measurable quantities that will be used for the evaluation of the sustainability KPIs.

This European Standard specifies the Key Performance Indicators (KPIs) to facilitate a tangible appreciation of the degree by which an NRD can be considered sustainable. It focuses on four key sustainability sets of factors;
(i) technical,
(ii) environmental,
(iii) economic
(iv) and social.
NRD manufacturers are required to declare the data available against a series of defined measurable quantities that will be used for the evaluation of the sustainability KPIs.

This document specifies requirements for the following road traffic noise reducing devices (as defined in 3.1):
-   noise barriers (as defined in 3.4),
-   claddings (as defined in 3.5),
-   covers (as defined in 3.6), and
-   added devices (as defined in 3.7).
These devices can include both acoustic and structural elements, where:
-   an acoustic element is an element whose primary function is to provide a noise reducing device with sound insulation, diffraction and/or sound absorption, it is a part of noise reducing device to be used along roads, and
-   a structural element is an element whose primary function is to support or hold in place acoustic elements, it is a part of noise reducing device to be used along roads. Depending upon the design of the noise reducing device, structural elements may potentially be tested separately from acoustic elements.
They can be made of different materials for which specific standards will be applied in accordance with the specifications prescribed hereafter. Some of the materials may contain dangerous substances, the reason why all the materials are declared.
This document identifies the relevant characteristics of road traffic noise reducing devices, the corresponding methods of evaluation and specifies the provisions on evaluation of conformity and marking.
This document covers acoustic, non-acoustic and long-term performance, but not aspects such as resistance to vandalism or requirements of visual appearance.
This document does not cover road surfaces.
This document consists of supporting standards as described in Clauses 2 and 4. The supporting standards have the following content:
-   EN 1793 1 establishes the intrinsic characteristic of sound absorption under diffuse sound field conditions and EN 1793 5 establishes the intrinsic characteristic of sound reflection under direct sound field conditions;
-   EN 1793 2 establishes the intrinsic characteristic of airborne sound insulation under diffuse sound field conditions and EN 1793 6 establishes the intrinsic characteristic of airborne sound insulation under direct sound field conditions;
-   EN 1793 4 determines the intrinsic characteristic of sound diffraction for added devices;
-   EN 1794 1 assesses the maximum load NRDs can withstand and determines the self-weight of an acoustic element, maximum load on structural elements, maximum bending moment, maximum deflection and impact of stones;
-   EN 1794 2 describes requirements concerning danger of falling debris, light reflection, release of dangerous substances, environmental protection and transparency;
-   EN 1794 3 describes resistance to brush fire and reactions to fire;
-   EN 14389 1 and EN 14389 2 gives durability requirements for acoustic and non-acoustic parameters during the working live of the product.

This document specifies the performance requirements and methods of evaluation for road traffic noise reducing devices. This document covers acoustic, non-acoustic and long term performance, but not aspects such as resistance to vandalism or requirements of visual appearance.
This document covers products used for road traffic noise reduction made from any materials. This document does not cover road surfaces or the airborne sound insulation of houses.
This document does not cover material specific characteristics necessary to meet the performance requirements of the standard. If existing, material specific standards should also apply in accordance with the specifications prescribed hereafter.

This European Standard specifies requirements for assessing the working life and provides the relevant exposure conditions.
Standards of construction and any material tests conducted should provide evidence of resistance to specified conditions selected from the following:
I.   Chemical Agents   Location
   dependent
II.   De-icing salt   Location/climate
   Dependent
III.   Dirty water/dust   Location/
   Climate
   dependent
IV.   Dew   Climate
   dependent
V.   Freeze/thaw   Climate
   dependent
VI.   Cold   Climate
   dependent
VII.   Heat   Climate
   dependent
VIII.   UV Radiation   Climate
   dependent
IX.   Traffic Vibration   Location
   dependent
X.   Biological Process   Climate
   dependent
XI.   Ozone   Location
   dependent
XII.   Water   Climate
   dependent
XIII.   Water spray   Location
   Wet/dry   dependent
NOTE   Special care has to be taken for combinations of different materials, whether inside a single device or in combination with other devices (for example: a combination of different acoustic elements or another combination of acoustic and structural elements)

This European Standard specifies requirements for assessing the working life and provides the relevant exposure conditions.
Standards of construction and any material tests conducted should provide evidence of resistance to specified conditions selected from the following:
I.   Chemical Agents               Location dependent
II.   De-icing salt                  Location/climate dependent
III.   Dirty water/dust               Location/climate dependent
IV.   Dew                     Climate dependent
V.   Freeze/thaw                  Climate dependent
VI.   Cold                     Climate dependent
VII.   Heat                     Climate dependent
VIII.   UV Radiation                  Climate dependent
IX.   Traffic Vibration               Location dependent
X.   Biological Process            Climate dependent
XI.   Ozone                     Location dependent
XII.   Water                     Climate dependent
XIII.   Water spray (Wet/dry)            Location dependent
NOTE   Special care has to be taken for combinations of different materials, whether inside a single device or in combination with other devices (for example: a combination of different acoustic elements or another combination of acoustic and structural elements).

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.

This European Standard specifies minimum requirements and other criteria for assessing the general safety and environmental performance of road traffic noise reducing devices under typical roadside conditions. Requirements for more onerous conditions are a matter for consideration by the designer. Appropriate test methods are provided where these are necessary, but for some aspects a declaration of material characteristics may be required for the information of designers. The treatment of each topic is covered separately in Annexes A to F.

This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided in order to take into account the wide diversity of practice in Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to noise reducing devices are covered in EN 1794-2.
This European Standard covers the current behaviour of the product. In order to assess its long term performances, EN 14389-2 should be used.
NOTE   The test procedure described in Annex A doesn't consider the fatigue effect.

This European Standard describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index.
The test method is intended for the following applications:
-   determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions;
-   determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use;
-   comparison of design specifications with actual performance data after the completion of the construction work;
-   verification of the long term performance of noise reducing devices (with a repeated application of the method);
-   interactive design process of new products, including the formulation of installation manuals.
The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers.
Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results need to be given in a restricted frequency range and the reasons for the restriction(s) need to be clearly reported.

This European Standard specifies the laboratory method for measuring the airborne sound insulation performance of road traffic noise reducing devices in reverberant conditions. It covers the assessment of the intrinsic performance of barriers that can reasonably be assembled inside the testing facility described in EN ISO 10140-2 and EN ISO 10140-4.
This method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed on roads in non-reverberant conditions.

This European Standard specifies criteria to categorise road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure, irrespective of the materials used.  A range of conditions and optional requirements is provided in order to take into account the wide diversity of practice in Europe. Individual aspects of performance are covered separately in the annexes.  Safety considerations in the event of damage to noise reducing devices are covered in Part 2 of this European Standard.

This European Standard specifies the laboratory method for measuring the sound absorption of flat noise barriers or flat cladding for retaining walls or tunnels. It covers the assessment of the intrinsic sound absorption performance of roadside noise reducing devices that can reasonably be assembled inside the testing facility described in EN ISO 354.
The test method in EN ISO 354 referred to in this European Standard is strictly valid only for plane absorbers; in particular, it excludes devices that act as weakly damped resonators. Some devices will depart significantly from these requirements and in these cases care is needed in interpreting the results.
NOTE   The test method in EN ISO 354 is based on measurements in a reverberation room where diffuse sound field conditions prevail. As a uniformly applicable method for the determination of the sound absorptive performance of noise reducing devices under free field conditions is still under development, the measurement results according to this European Standard are temporarily considered relevant for application on noise reducing devices in reverberant as well as in free field conditions.

TC/EC - Replacement of Table ZA.3 based on CEN/TC 226 Resolution 331/2008 considering the EC query given in Construct 07/802

This document specifies the performance requirements and methods of evaluation for road traffic noise reducing devices. This document covers acoustic, non-acoustic and long term performance, but not aspects such as resistance to vandalism or requirements of visual appearance.
This document covers products used for road traffic noise reduction made from any materials. This document does not cover road surfaces or the airborne sound insulation of houses.
This document does not cover material specific characteristics necessary to meet the performance requirements of the standard. If existing, material specific standards shall also apply in accordance with the specifications prescribed hereafter.

This European Standard defines the means for evaluating the acoustic durability of Road Traffic Noise Reducing Devices.
In this European Standard, the sound absorption is characterised by the sound reflection index DLRI as defined in CEN/TS 1793-5. The airborne sound insulation is characterised by the airborne sound insulation index DLSI as defined in CEN/TS 1793-5.

This document specifies assumed working life requirements and is also intended to assist suppliers in its prediction.
It is to be used only for devices manufactured from materials covered by documents which allow prediction of working life (see Annex B). Materials excepted are those which do not affect the non acoustic performance of the device required by EN 1794 parts 1 and 2.
Standards of construction and any material tests conducted should provide evidence of resistance to specified conditions selected from the following:
I.   Chemical Agents   Location
   dependent
II.   De-icing salt   Location/climate
   Dependent
III.   Dirty water/dust   Location/
   Climate
   dependent
IV.   Dew   Climate
   dependent
V.   Freeze/thaw   Climate
   dependent
VI.   Cold   Climate
   dependent
VII.   Heat   Climate
   dependent
VIII.   UV Radiation   Climate
   dependent
IX.   Traffic Vibration   Location
   dependent
X.   Biological Process   Climate
   dependent
XI.   Ozone   Location
   dependent
XII.   Water   Climate
   dependent
XIII.   Water spray   Location
   Wet/dry   dependent
   dependent
IV.   Dew   Climate
   dependent
V.   Freeze/thaw   Climate
   dependent
VI.   Cold   Climate
   dependent
VII.   Heat   Climate
   dependent
VIII.   UV Radiation   Climate
   dependent
IX.   Traffic Vibration   Location
   dependent
X.   Biological Process   Climate
   dependent
XI.   Ozone   Location
   dependent
XII.   Water   Climate
   dependent
XIII.   Water spray   Location
   Wet/dry   dependent

This part of prEN 1793 specifies the laboratory method for measuring the sound absorption of flat noise barriers or flat cladding for retaining walls or tunnels. It covers the assessment of the intrinsic sound absorption performance of roadside noise reducing devices which can reasonably be assembled inside the testing facility described in EN 20354.

This part of prEN 1973 specifies the laboratory method for measuring the airborne sound insulation performance of roadside noise barriers. It covers assessment of the intrinsic performance of barriers which can reasonably be assembled inside the testing facility described in EN ISO 140-3.

This European Standard specifies minimum requirements and other criteria for assessing the general safety and environmental performance of road traffic noise reducing devices under typical roadside conditions. Requirements for more onerous conditions are a matter for consideration by the designer. Appropriate test methods are provided where these are necessary, but for some aspects a declaration of material characteristics can be required for the information of designers. The treatment of each topic is covered separately in annexes A to F.

This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided to allow for the wide diversity of practice within Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to noise reducing devices are also covered in Part 2 of this European Standard.

This document describes a test method for determining the intrinsic characteristics of sound diffraction of added devices installed on the top of traffic noise reducing devices. The test method prescribes measurements of the sound pressure level at several reference points near the top edge of a noise reducing device with and without the added device installed on its top. The effectiveness of the added device is calculated as the difference between the measured values with and without the added devices, correcting for any change in height.
The test method is intended for the following applications:
· preliminary qualification, outdoors or indoors, of added devices to be installed on noise reducing devices;
· determination of sound diffraction index difference of added devices in actual use;
· comparison of design specifications with actual performance data after the completion of the construction work;
· verification of the long term performance of added devices (with a repeated application of the method).
The test method can be applied both in situ and on samples purposely built to be tested using the method described here.
Results are expressed as a function of frequency, in one-third octave bands between 100 Hz and 5 kHz. If it is not possible to get valid measurements results over the whole frequency range indicated, the results should be given in the restricted frequency range and the reasons of the restriction(s) should be clearly reported. A single-number rating is calculated from frequency data.
For indoors measurements see annex B.

This European Standard specifies minimum requirements and other criteria for assessing the general safety and environmental performance of road traffic noise reducing devices under typical roadside conditions. Requirements for more onerous conditions are a matter for consideration by the designer. Appropriate test methods are provided where these are necessary, but for some aspects a declaration of material characteristics can be required for the information of designers. The treatment of each topic is covered separately in annexes A to F.

This European Standard specifies criteria to categorize road traffic noise reducing devices according to basic mechanical performance under standard conditions of exposure, irrespective of the materials used. A range of conditions and optional requirements is provided to allow for the wide diversity of practice within Europe. Individual aspects of performance are covered separately in the annexes. Safety considerations in the event of damage to noise reducing devices are also covered in Part 2 of this European Standard.

This Part of EN 1793 specifies the test method for determining the sound absorption and airborne sound insulation. It covers assessment of the performance of barriers which can reasonably be assembled inside the testing facility.