Generally are placed at the road edge to reflect traffic noise. Some sound still passes over the barrier but there is a reduction in overall noise level behind the barrier. Reflective barriers are typically higher than other types.
These disperse the noise upwards and/or downwards due to their inclination and surface pattern. They are often considered to be a variation of the reflective barrier.
Sound is absorbed and dissipated by sound wave pressure moving through a carefully designed membrane or passage. These barriers generally use a propriety system for the sound absorption. Generally they are not effective for wide easements.
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