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The present document describes a test method for measuring two quantities representative of the intrinsic characteristics of traffic noise reducing devices : the reflection index for sound reflection and the sound insulation index for airborne sound insulation. The test method is intended for the following applications : -- determination of the intrinsic characteristics of sound reflection and 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 sound reflection and 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).