Residential roadway volume control

Having recently moved back to the Tri State, I am woken up several times a night by wailing sirens. I live in the downtown area, so I figure the ambulances and police are driving through since its the most logical path through downtown. So anyway here is my suggestion. You know how on the highway there are those special walls that are built to take sound waves and deflect them back across the highway at the grooved walls so that the sound doesnt escape the horizontal span of road. Well, imagine that in a residential area, perhaps built into the walls of homes - deflecting the sound waves, and at the top some sort of mirrored triangulation to capture the waves and stop them from rising, like a top covering (twisting/curving/bending sound waves), so you have a 50 ft by 50 ft box, which contains the sound waves force_field_ed to street area. This way the sirens noise is only bothering those who it is pertinent for, drivers who need to get out of the way.