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Within 15–50 m from the roadside, air pollution concentration levels at the lee side of the noise barriers may be reduced by up to 50% compared to open road values. [13] Noise barriers force the pollution plumes coming from the road to move up and over the barrier creating the effect of an elevated source and enhancing vertical dispersion of ...
Studies have found that reducing the speed at which drivers travel along the road produces less noise, potentially reducing the road's barrier effect. [6] The reduction in noise coming from the highway is assumed to make the road surface less intimidating for animals, potentially allowing crossings to take place.
However, in some places, objects that may become hazards to erratic vehicles may be banned in projects, such as trees, large shrubs, boulders, dirt mounds, or concrete sections as improper landscaping can reduce visibility or increase roadway debris. [3] Highway beautification may occur in urban, semi-urban, or rural areas. [4]
An effective model for noise control is the source, path, and receiver model by Bolt and Ingard. [9] Hazardous noise can be controlled by reducing the noise output at its source, minimizing the noise as it travels along a path to the listener, and providing equipment to the listener or receiver to attenuate the noise.
"With landscape improvements hovering at a 200 to 400 percent return on investment, it makes a lot of sense to hire a designer and do it right." Now before you go all-out with a yard redesign, let ...
Nestlings exposed to noise may also suffer from reduced immune function. [40] Road noise can be a nuisance if it impinges on population centres, especially for roads at higher operating speeds, near intersections and on uphill sections. Noise health effects can be expected in such locations from road systems used by large numbers of motor vehicles.
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