Interstate 20

Interstate 20 (I‑20) is a major east–west Interstate Highway in the Southern United States. I-20 runs 1539 mi beginning at an interchange with I-10 in Reeves County, Texas, and ending at an interchange with I-95 in Florence, South Carolina. Between Texas and South Carolina, I-20 runs through northern Louisiana, Mississippi, Alabama, and Georgia. The major cities that I-20 connects to include Dallas-Fort Worth, Texas; Shreveport, Louisiana; Jackson, Mississippi; Birmingham, Alabama; Atlanta, Georgia; and Columbia, South Carolina.

From its terminus at I-95, the highway continues about 2 mi eastward into the city of Florence as I-20 Business (I-20 Bus.).

Route description

 * TX
 * 636.08 mi
 * LA
 * 189.87 mi
 * MS
 * 154.61 mi
 * AL
 * 214.70 mi
 * GA
 * 202.61 mi
 * SC
 * 141.51 mi
 * Total
 * 1539.38 mi
 * }
 * SC
 * 141.51 mi
 * Total
 * 1539.38 mi
 * }
 * 1539.38 mi
 * }

I-20 runs from Texas to South Carolina serving major southern economic hubs such as Dallas–Fort Worth and Atlanta.

Texas
I-20 begins in western Reeves County at a fork with I-10. From there, the highway travels east-northeastward through Odessa, Midland, and Abilene before turning eastward toward the Dallas–Fort Worth metroplex. The La Entrada al Pacífico corridor runs along I-20 between US Route 385 (US 385) and Farm to Market Road 1788 (FM 1788). Between Monahans and I-10, I-20 has an 80 mph speed limit.

From the highway's opening in the 1960s through 1977, I-20 originally went through the heart of the metroplex via the Dallas–Fort Worth Turnpike. This old route is now signed I-30 (Dallas–Fort Worth Turnpike and from US 80/I-30 intersection at Mesquite to Downtown Dallas), US 80 (former stretch between I-635 and Terrell), and Spur 557 (bypass around Terrell). In 1977, I-20 was rerouted to go through the southern sections of Fort Worth, Arlington, Grand Prairie, Dallas, and Mesquite. It split off from the old route initially at I-820 in west Fort Worth the later on at its current junction near Aledo in Parker County. It rejoins the old route near Terrell. Part of I-20 in Dallas used to be signed as I-635 and shares the Lyndon B. Johnson Freeway name with the remainder of I-635. Parts on the south side of Fort Worth were originally signed as I-820.

I-20 continues eastward from Terrell, bypassing Tyler, Longview, and Marshall before crossing the Louisiana border near Waskom.

Louisiana
In Louisiana, I-20 roughly parallels US 80 through the northern part of the state.

Entering the state from near Waskom, Texas, the highway immediately enters the Shreveport–Bossier City metropolitan area, intersecting I-49 near downtown Shreveport and passing close to Barksdale Air Force Base in Bossier City.

I-20 traverses mainly rural, hilly terrain, bypassing Minden, Grambling, and Ruston before reaching Monroe.

From Monroe, I-20 enters flatter terrain as it approaches the Mississippi River. Before crossing the Mississippi, the highway passes Tallulah. At the Mississippi River, I-20 leaves Louisiana and enters Vicksburg.

Mississippi
Upon entering Mississippi by crossing the Mississippi River, I-20 immediately enters Vicksburg. Between Edwards and Clinton, the highway mostly follows the original two-lane routing of US 80. In Jackson, I-20 sees a short concurrency with both I-55 and US 49. Also in Jackson is an unusually expansive stack interchange, at the junction of I-20, I-55 north, and US 49 south. The interchange replaces a former directional interchange at I-55 north and a cloverleaf interchange at US 49. From the stack, I-20 continues eastward to Meridian, where it begins the nearly 160 mi overlap with I-59.

The route of the Mississippi section of I-20 is defined in Mississippi Code § 65-3-3.

Alabama
I-20 (along with I-59) crosses the Alabama state line near York, and it stays conjoined as it passes through western Alabama and Tuscaloosa. At Birmingham, the two highways pass through downtown together before splitting at exit 130 just east of Birmingham–Shuttlesworth International Airport. I-20 continues eastward through Oxford–Anniston and the Talladega National Forest, passing by Talladega Superspeedway in the process, which is visible from the highway.

Also in Birmingham, the intersection of I-20/I-59 and I-65 was known as a Malfunction Junction because of the interchange's somewhat-confusing design, and the number of traffic accidents that occurred there. This section of the Interstate and its interchanges have since been reconfigured.

Georgia
I-20 enters Georgia near Tallapoosa and after passing through western Georgia, it enters the Atlanta metropolitan area. On clear days, eastbound motorists get their first view of Downtown Atlanta as they come over the top of Six Flags Hill. The Six Flags Over Georgia amusement park is easily visible off exit 46 eastbound. The highway then passes through the center of Atlanta, meeting with I-75 and I-85, which share a common expressway (the Downtown Connector). It continues through the Atlanta metropolitan area eastward and through the eastern half of Georgia until it exits the state, crossing the Savannah River at Augusta.

Throughout the state, I-20 is conjoined with unsigned State Route 402 (SR 402). Also, I-20 from the Alabama state line to I-285 in Atlanta is named the "Tom Murphy Freeway", but it is called the "Ralph David Abernathy Freeway" within I-285. The Interstate Highway is also named the Purple Heart Highway from I-285 in DeKalb County to US 129/US 441/SR 24 in Madison, Georgia, and it is called the Carl Sanders Highway from US 129/US 441/SR 24 to the South Carolina state line.

South Carolina
Upon leaving Augusta, I-20 crosses the Savannah River and enters the Palmetto State and heads northeastward, bypassing Aiken and Lexington before reaching the state capital of Columbia, which can be reached most directly by taking I-26 east at exit 64 ("Malfunction Junction"), then, almost immediately, I-126/US 76.

At Columbia, I-20 bypasses the city to the north and again turns northeastward, bypassing Fort Jackson and Camden. After crossing the Wateree River, it turns due east and passes by tiny Bishopville, before reaching the Florence area. It is near Florence where I-20 sees its eastern terminus at I-95. However, for about 2 mi, the highway continues into Florence as I-20 Bus.

I-20 in the Palmetto State is known as either the J. Strom Thurmond Freeway or John C. West Freeway. The first section to be completed was the bridge over the Savannah River in 1965; the last, the section between US 401 and I-95 (including the business spur), opened in August 1975.

History
I-20 was built in 1957 connecting Texas to the east coast running through Shreveport, Ruston, and Monroe making it their first Interstate.

I-20's exit numbers in Georgia were changed in 2000.

In 2003, the North Carolina Department of Transportation proposed extending I-20 eastward from Florence to Wilmington at the behest of North Carolina Governor Mike Easley and his 'Strategic Transportation Plan' for the southeast portion of the state. The proposed route would follow US 76 east from Florence to Whiteville, North Carolina, then parallel US 74/US 76 into Wilmington. Part of this route is already designated the future eastern extension of I-74. As part of the 2005 Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users transportation legislation, North Carolina received $5 million (equivalent to $ in ) for a feasibility study for this extension. While this extension has considerable support among towns in southeastern North Carolina, the South Carolina Department of Transportation has stated that they have no interest in upgrading their portion of US 76 to an Interstate. Instead, South Carolina is concentrating their efforts on plans to build I-73 that will terminate near Myrtle Beach. This proposed extension is currently unfunded.

Junction list

 * Texas
 * in Reeves County
 * in Pecos
 * in Odessa
 * in Big Spring
 * east of Roscoe. The highways travel concurrently to the Tye–Abilene city line.
 * in Abilene
 * in Baird
 * in Cisco
 * south-southeast of Brazos
 * in Hudson Oaks
 * northeast of Aledo
 * in Fort Worth
 * in Fort Worth
 * in Benbrook
 * in Fort Worth
 * in Fort Worth. I-20/US 287 travels concurrently to Arlington.
 * in Grand Prairie
 * in Dallas
 * on the Dallas–Lancaster city line
 * on the Dallas–Hutchins city line
 * on the Dallas–Balch Springs city line
 * in Balch Springs
 * in Lindale
 * south-southeast of Winona
 * northeast of Kilgore. The highways travel concurrently to Longview.
 * in Marshall
 * west-southwest of Jonesville. The highways travel concurrently to west of Waskom.


 * Louisiana
 * in Greenwood
 * in Shreveport
 * in Shreveport
 * in Shreveport
 * in Shreveport
 * in Shreveport
 * in Shreveport. The highways travel concurrently to Bossier City.
 * in Bossier City
 * near Haughton
 * in Dixie Inn. The highways travel concurrently to Minden.
 * southeast of Minden
 * in Ruston
 * east-northeast of Calhoun
 * in Monroe
 * in Rayville
 * in Tallulah
 * in Delta. The highways travel concurrently to Clinton, Mississippi.


 * Mississippi
 * in Vicksburg. The highways travel concurrently through Vicksburg.
 * in Jackson. I-20/US 49 travels concurrently to Pearl.
 * in Jackson. I-20/I-55 travels concurrently to Richland
 * in Brandon
 * in Brandon
 * east-southeast of Lake
 * west-southwest of Meridian. The highways travel concurrently to Meridian.
 * in Meridian. The highways travel concurrently to Birmingham, Alabama.
 * in Meridian. The highways travel concurrently through Meridian.
 * in Meridian
 * west-northwest of Kewanee


 * Alabama
 * near Cuba
 * south of Knoxville
 * in Tuscaloosa
 * in Tuscaloosa
 * in Tuscaloosa
 * in Tuscaloosa
 * south of Lake View. The highways travel concurrently to Bessemer.
 * southwest of McCalla
 * in Birmingham
 * in Birmingham
 * in Birmingham
 * in Birmingham
 * in Irondale
 * in Leeds
 * on the Leeds–Moody line
 * northwest of Cooks Springs. The highways travel concurrently to Pell City.
 * in Pell City
 * in Riverside
 * east of Oxford


 * Georgia
 * in Bremen
 * in Atlanta
 * in Atlanta
 * in Atlanta
 * on the Panthersville–Candler-McAfee CDP line
 * southeast of Lithonia. The highways travel concurrently to Covington.
 * in Social Circle
 * in Madison
 * in Barnett
 * south of Appling
 * in Augusta


 * South Carolina
 * in North Augusta
 * in North Augusta
 * north-northeast of Aiken
 * southeast of Batesburg-Leesville
 * east of Lexington
 * north of Oak Grove
 * on the Seven Oaks–St. Andrews CDP line
 * in St. Andrews
 * north of Columbia
 * in Columbia
 * in Dentsville
 * on the Dentsville–Woodfield CDP line
 * in Lugoff
 * in Camden
 * southwest of Bishopville
 * northeast of Lamar
 * in Florence

Auxiliary routes
Two I-420s were planned but never completed or built. One was to be a bypass around Monroe, Louisiana, but was never built. The other I-420 was planned as a bypass to the south of Downtown Atlanta. Due to anti-freeway sentiments, this I-420 was never completed, and the already-built portion has been signed as State Route 154 (SR 154)/SR 166, named the Langford Parkway (formerly the Lakewood Freeway).


 * Shreveport, Louisiana: I-220
 * Jackson, Mississippi: I-220
 * Augusta, Georgia: I-520
 * Fort Worth, Texas: I-820