Acoustic Performance of a Multiple Edge Noise Barrier Profile at Motorway Sites

Abstract The primary object of the work described in this paper was to examine the roadside performance of a multiple edge profile which previous work had indicated would lead to greater noise screening when attached to the top edge of an existing noise barrier. The profile consists of vertical side panels 0.5 m deep which are attached to the posts of an existing barrier without increasing its overall height. The profile was tested at three sites adjacent to the M25 motorway. It was concluded that the screening performance of simple barriers 2 and 3 m high located adjacent to a motorway can be significantly improved by the RTB profile by an amount depending on site conditions. Under favourable conditions the improvement was predicted to be over 3 dB (A).