Amend HB 691 by inserting the following appropriately numbered SECTION and renumbering the remaining SECTIONS of the bill accordingly: SECTION ____. As soon as practical, the Texas Department of Transportation shall conduct a cost-benefit study of the construction of a sound barrier wall to reduce highway noise for residences located west of Interstate Highway 610 southward from the Braeswood Boulevard exit, including the South Post Oak exit, which must include a study of the effectiveness of existing sound barrier walls along the right-of-way at that location.