Thanks for sharing your experience, Maya. Indeed, living about a quarter mile from the highway, I will experience no benefit from the sound walls, if constructed, and absolutely expect to experience negative effects from the tree clearing that the MTA mentioned would be part of the project, but they wouldn't really admit that more sound for folks outside the benefit zone of the sound wall was even a possibility. I also got pretty unsatisfactory answers when pointing out to one of the engineers that there's
basically never traffic of any appreciable volume along the exit 48-53
stretch.
The same thing happened at the airport in Louisville while I was involved there - they cleared a huge amount of brush along the runways and acted surprised when neighbors complained that apparent noise had increased. The airport's claim was that they collected readings and the volume had not increased, but it was pretty easy to see what was happening there - the overall sound level likely didn't increase, as the loudest sounds from the airport are low-end sounds, which weren't obstructed by the brush in the first place but also aren't the most noticeable to us in our daily lives. Removing the brush made it much easier for more noticeable and annoying higher frequencies, which the brush did interrupt, to reach the neighbors, impacting their actual lives but not pushing an SPL meter's max reading any higher than it already was, because those frequencies still weren't "louder" than the low end that was already being measured. A classic gap between scientific measurement and human experience (or, why you need psychoacousticians in the planning process, not just acoustical engineers).
After Joey left, Myles and I did get a couple of the engineers to admit that the "requirement" to add capacity in order to build a sound wall is an internal MTA policy following federal guidance, and can be changed with nothing more than the agreement of the MTA board. Their apparent fear is that if they shifted to a model without this requirement, they would be inundated with requests for sound walls, and would not have the funding to build them all. So the "requirement" is really a way of prioritizing/filtering the needs/requests, which is an understandable goal for an agency with limited resources, but the goal doesn't dictate this particular way of prioritizing! This model also means that no historical harm can be addressed without first making the harm worse. Which is...not a great model.
Aaron