posted on May, 23 2011 @ 06:50 AM
The problem with noises like sweepers or other vehicles is there should be some kind of Doppler effect because they're in motion, even if a few
streets over. These noise phenomena intrigue me but I haven't heard anything like it in my area. Of course, I'm only a few miles away from the
airport and there's an Air Force base right next to it, so loud rumbling noises go over my house almost constantly, so I probably wouldn't notice it
unless I was outside and it was constant and long enough to make me take notice. The giant military cargo planes that fly over my home are low, loud,
obnoxious and impossibly slooooowww, so their noise lasts quite a while when they go over.