A traffic noise study along the entire project limits is being completed as part of the environmental review process. The study will look for traffic noise impacts. Traffic noise impacts are different for each type of land use. For example, a residential area is considered impacted at 66 decibels. Noise walls will be considered where traffic noise impacts are identified.  Proposed noise walls will be recommended for construction if they are shown to noticeably reduce future traffic noise for residents, avoid serious conflicts with things such as utilities, and are reasonably cost effective.
The FHWA will only fund noise walls that meet certain criteria:
It must be effective, meaning it will noticeably reduce noise levels for nearby residents.
The construction cost ($45 per square foot for the single side face surface of the barrier) divided by the number of benefiting units must be equal to or less than $56,428 (2024) per benefiting unit.
The wall must be physically able to be built without any major utility or other conflicts or without creating any safety concerns.
The majority of those who would benefit from the wall must vote in favor of construction.
Studies have shown that noise barriers are ineffective at providing mitigation for locations 500 feet or further from the source.