Talk:Noise barrier

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Contents 1 No definitions found for "offhaul" 2 Caps 3 Factor of 2? 4 "Most commonly a noise barrier consists of a masonry wall or earthwork" 5 bird friendly noise screens 6 References requested 7 9 dB reduction is NOT equivalent to 80% reduction in noise

[edit] No definitions found for "offhaul"

Perhaps use a different word.

done . Anlace 19:14, 17 July 2006 (UTC)

[edit] Caps

I remember seeing a program about soundwall design, which discussed the addition of a variety of devices to the top of the wall. Some looked like the capital of a column, others like horizontal louvers. I believe in all cases the idea was to inhibit refraction of the roadnoise off the wall top and down into the quietened space behind (making it refract off at a higher angle meant that quite space was larger). If someone can find anything about this (my initial google wasn't very promising) then that would make an interesting addition to this article. -- Finlay McWalter | Talk 00:23, 16 July 2006 (UTC)

ill try to get to this in next 30 days . i have all the info Anlace 19:06, 17 July 2006 (UTC)

ok i got to it early and added a para under tradeoffs. cheers. Anlace 19:13, 17 July 2006 (UTC)

[edit] Factor of 2?

"Generally a two to one ratio of berm cross sectional width to height is required. Thus, for example, to build a six foot high berm, one needs an available width of 24 feet."

Where did the extra factor of 2 come from? --Heron 20:31, 9 September 2006 (UTC)

article edited and is now self-consistent Anlace 21:22, 9 September 2006 (UTC)

[edit] "Most commonly a noise barrier consists of a masonry wall or earthwork"

Most commonly?? I have never seen a noise barrier made of masonry, and I've done a lot of driving all over the world. This isn't an accurate statement Klafubra 11:54, 13 March 2007 (UTC)

most of USA noise barriers are of masonry, and this is the country where by far most lineal miles of barrier hae been installed. Anlace 22:24, 16 March 2007 (UTC)

[edit] bird friendly noise screens

hello my english is quite poor, so I would be glad if someone with native tongue could work this issue into the article: transparent noise screens are a big problem for birds, causing high casualty. http://www.windowcollisions.info/e/good_solutions/noise_barriers_transparent_walls.html stripes as specified in the article is standard in some european countries cheers —The preceding unsigned comment was added by Kaeptn*haddock (talk • contribs) 16:12, 23 March 2007 (UTC).

[edit] References requested

Please provide a reference that shows where "Design of Noise Abatement Structures along Foothill Expressway" was published, then use the publication information in that reference for the article, or remove this reference. Off line resources are fine, as I cannot find any on-line resources, and I will verify the publication. Thank you. KP Botany 22:23, 21 April 2007 (UTC)

[edit] 9 dB reduction is NOT equivalent to 80% reduction in noise

In "Theory of noise barrier design" section, the author states "a reduction of nine decibels is equivalent to elimination of about 80 percent of the unwanted sound." However, many sources, including Wikipedia article on "Decibel", describe twice-loudness as occuring at 10 dB. A noise reduction of less than one half (<10dB) will not eliminate 80% of unwanted sound. That is, unless the original sound source is already very quiet (unlike the road noise described in the article), or, unless the idea of "unwanted sound" is very different from mine.

Consider the other Wikipedia article on examples of sound pressure levels, expressed in dB.