Four distinct control points were identified within the General Study Area. In Savannah, the control point is along I-516 north of I-16. In Augusta, the control point follows I-520 around the southern loop of the city and extends along I-20 to US 78, approximately 30 miles west of the Augusta. At Lavonia, the control point extends for 65 miles along I-85 from west of Greenville, SC to Commerce, GA. In Knoxville, the control point covers the southern portion of the city, from I-75 at Loudon, south to include Maryville, and east to I-40 at Strawberry Plains Pike.