1 Scope
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:
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— 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;
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— determination of the in situ intrinsic characteristics of sound reflection of noise reducing devices in actual
use;
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— comparison of design specifications with actual performance data after the completion
of the construction work;
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— 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:
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 a restricted frequency
range and the reasons of the restriction(s) should be clearly reported.