Dear Nick Licata:
i think you are under the misimpression that noise does not radiate in all directions equally, but instead stays at the elevation it is generated. I would like to diabuse you of this notion. I work on the central waterfront. Despite the fact that Viaduct traffic is from 20' to 40' above my head, i can hear each individual vehicle barreling past at 60 mph. it is like being on an airport runway, except the noise is constant. Its more like standing next to a shopvac.
Also, traffic that moves at 60 mph with a roof over it makes considerably more noise than traffic that moves at 30 mph & stops at lights & has no surface to reflect off of.
But, i'm no maritime employee or cement truck driver, so what do i know?
http://seattlepi.nwsource.com/transportation/307563_surface15.htmlThe concept isn't a slam dunk, Council President Nick Licata said, and it needs further development, but it could be more of a waterfront barrier than an elevated highway.
"The noise will be right there" at ground level, he said.