The worst is jake braking [1] that tractor trailers use. I live about 300 or so yards from the highway, and constantly hear this noise during the day.
I don't recall ever hearing such system in my country, so I expect this is a US-only thing (I'm from Europe). I don't think this kind of system would even be legal in my country, nor would it be socially accepted.
Semi-trucks work just fine with regular silent brakes in the rest of the world, so is there any legit reason to equip a truck with such system, apart from the driver thinking it is cool?