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t45 (4399 words) |
 | However, when existing highway systems are renovated or if restrictions are placed on the routing of new highway systems or use of adjacent land, the most practical solution to noise control may be the use of noise barrier walls to isolate the highway noise sources from the surrounding communities. |
| To understand the function of a noise barrier wall or how the wall reduces the noise level perceived by a receiver, it is necessary to discuss some of the fundamental principles involved in sound propagation and noise reduction. |
| When a noise barrier wall is placed between the noise source and the receiver, the barrier disperses the sound along three paths: a diffracted or bent path over the top of the wall, a reflected path away from the receiver and a transmitted path through the wall (Fig. |
| Barrier Highway - definition of Barrier Highway in Encyclopedia (108 words) |
| The Barrier Highway is a State highway in New South Wales, Australia. |
| The Barrier Highway starts at Nyngan where it joins the Mitchell Highway. |
| The area traversed by the Barrier Highway is remote and very sparsely settled. |
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