Noise barriers will be constructed under a separate project in which they were planned as a need and voted on to advance. The schedule for that is dependent on the unique construction timeline for each project. Noise barriers constructed as part of adjoining projects may be removed as part of the construction process for the SR 400 Express Lanes. The Noise Impact Assessment Study for the SR 400 Express Lanes will determine the acoustic impact of the proposed project and the need for abatement measures as a result of this express lanes project is being evaluated separately than previously analyzed projects. It is important to evaluate impacts as a result of the express lanes project, and ensure that any noise abatement (e.g., barrier) would be effective at noise reduction and meet the cost feasibility requirements. As mentioned above, the determination of noise impacts and abatement measures will comply with Title 23, Code of Federal Regulation (CFR), Part 772, and the GDOT’s policies for highway noise barrier construction.