CEN/TS 1793-4:2003

Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction CEN/TS 1793-4:2003

Publication date:   Jun 30, 2004

General information

99.60 Withdrawal effective   Mar 18, 2015


CEN/TC 226 Road equipment

Technical Specification

17.140.30   Noise emitted by means of transport | 93.080.30   Road equipment and installations



Language in which you want to receive the document.


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.

Related legislation

Legislation related to this standard


Construction products


Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec

Life cycle


CEN/TS 1793-4:2003
99.60 Withdrawal effective
Mar 18, 2015


EN 1793-4:2015