We have a beautiful home in a great neighborhood but the back of our house is only about half an acre from a busy street. Our master bedroom was really noisy. We installed acoustic inserts in all five, 8-foot-tall windows. The quietness is better than what we were hoping for. Passing cars cannot be heard at all. Trucks make a low, soft whish, and 18-wheelers sound like a slight gust of wind. In fact, we have ordered six more inserts for the street-facing windows in the living room. The entire wall is made of windows and narrow limestone columns, so we're looking forward to the second addition of inserts.