I'm sleeping next to a busy road with a lot of traffic noise (both low and high frequencies, although the low are the most annoying). The noise seems to be coming through the windows rather than the walls.
It's a rented apartment so I cannot make any major modifications like blocking off the window and it is also nice to be able to get the light in during the day. I've installed some somewhat heavy 6ft/2m high curtains that help a bit, but I'd like to do more.
The window consists of a 1/4" outer piece of glass, then 3" of air before another an inner 1/2" piece of glass. I'm thinking if it would help with the noise at night if I put between the glass pieces 3" of acoustic foam (e.g. this), where there's currently air?
As a side-question, would it help if the outer piece was replaced with a 1/2" thickness piece of glass?