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Interstate 3 is mandated to be studied by Section 1927 of SAFETEA-LU, the 2005 Transportation Authorization Act. The Federal Highway Administration (FHWA) has been charged with carrying out that study. See the Web site the FHWA maintains dedicated to Section 1927.
Link to FHWA page about the corridors here.
Additional maps will be developed as the study progresses.

Map shows portions of Mississippi, Alabama, Georgia, Tennessee, South Carolina and North Carolina with corridors stretching approximately east to west from Natchez, Mississippi to Augusta, Georgia and north to south from Knoxville, Tennessee to Savannah, Georgia.

Map shows portions of Mississippi, Alabama, Georgia, Tennessee, South Carolina and North Carolina and portions of Interstates in that region with corridors stretching approximately east to west from Natchez, Mississippi to Augusta, Georgia and north to south from Knoxville, Tennessee to Savannah, Georgia.

Map shows portions of Mississippi, Alabama, Georgia, Tennessee, South Carolina and North Carolina and portions of Interstates in that region with corridors stretching approximately east to west from Natchez, Mississippi to Augusta, Georgia and north to south from Knoxville, Tennessee to Savannah, Georgia.