 OTA announced plans to include sound barriers at three points along the turnpike in April 1990 . The locations were recommended by a report commissioned by OTA , using guidelines published by the Federal Highway Administration ( FHWA ) . While another thirteen locations were likely to have similar noise levels as the three sites selected to receive barriers , abatement was not considered at those locations because they did not meet other criteria , including minimum population density . Although OTA was not required to follow FHWA guidelines on the Creek Turnpike because it was not a federally funded project , it opted to do so anyway . 
