| 摘要 |
<p>The invention provides a noise barrier comprising a main screen (10), which in use faces substantially towards a source of noise (12) so as to attenuate the noise level on the opposite side of the barrier from the source, and an additional screening element (11) connected to the main screen, which additional element also faces, in use, substantially towards the noise source and is displaced from the main screen in a direction either towards or away from the noise source, the main screen and the additional screening element both comprising substantially sound-opaque regions which extend downwardly from their upper edges over at least the height of the shorter of the main screen and the additional screening element, and the lower edge of the shorter of the two being higher, in use, than the lower edge of the taller of the two.</p> |
