Also briefly mentioned in the article: http://www.ipam.ucla.edu/research-articles/fractal-acoustic-barrier/ http://www.ipam.ucla.edu/research-articles/fractal-a

Also briefly mentioned in the article: http://www.ipam.ucla.edu/research-articles/fractal-acoustic-barrier/ http://www.ipam.ucla.edu/research-articles/fractal-acoustic-... This look's very promising. Imagine the public health benefits we could reap from eliminating 98% of highway noise! And that's from 2009.