Highway noise barriers: new shapes

The Acoustic Performance of an Inclined Barrier for High-Rise Residents

“…Barriers are often placed on the roadside for controlling tra$c noise. Normally, about 5}10 dB (A) insertion loss is expected at nearby locations [1]. However, the performance of a barrier is not as good as we anticipated when parallel barriers are placed on the opposite sides of highways.…”

Acoustical barrier for tonal noises

“…A large body of research work has been carried out to understand the diffraction of sound around barriers, to predict their performance and to develop more efficient designs. The barrier performance depends on source characteristics and barrier properties [1][2][3][4][5]. For example, if the acoustical energy transmitted through a barrier structure is negligible, absorption treatment on barrier surfaces has little effect on the performance [6] but it will substantially improve the performance if strong multiple reflections are present [7,8] or favourable diffraction angles result in [9].…”

Optimized height of noise barrier for non-urban highway using artificial neural network

“…The relative acoustical performances established by scale model testing of a number of relatively novel noise barriers in typical highway situations was described (May and Osman 1980). Considered barriers include thin, wide, T-profiled, cylindrically topped, corrugated, inclined, Y-profiled, arrow-profiled, etc.…”