We do not currently have the standalone cost out broken out for the noise walls because we are still in the study phase. Sound barrier costs vary by project depending on many aspects, so a clear answer is not available. Any of the costs associated with the sound walls are borne by the project’s sponsors, for example FHWA and PennDOT, not by property owners. It’s not necessarily the traffic increase that warrants the analysis, it’s the movement of traffic, the redistribution of traffic that triggers the analysis and then it’s strictly decibels if it’s over the 66 decibel threshold for residential or there’s the increased component if there is an increase of so many decibels then it triggers.
There’s also a function of the traffic volumes, the composition of the traffic, cars versus trucks, which can have an increase in the volume, as well as, the proposed distance from the noise sensitive receptor. At this time it’s difficult to identify specific volume increases that would generate traffic noise impacts.