Interstate 20

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Interstate 20 travels across the heart of the Palmetto State, linking the capital city of Columbia with North Augusta to the west and Florence to the east. Known as the Strom Thurman Freeway throughout South Carolina, I-20 serves commuter traffic through the Columbia metropolitan area and long distance travelers between the I-95 corridor and Atlanta, Georgia. Business Spur I-20 (David H. McLeod Boulevard) extends 1.8 miles east from the end of I-95 to U.S. 76 (Palmetto Street) by Florence Mall.

Interstate 20 South Carolina Guides

Through the Columbia area, speed limits along I-20 reduce to 60 miles per hour. The six lane freeway between I-26 and I-77 comprises the northern third of the Columbia Beltway. Widening of I-20 east from I-77 to a point beyond Spears Creek Church Road was completed in 2015. Additional expansion at Lexington started in 2016. Work on the 11 mile section from west of Longs Pond Road to U.S. 378 runs through Spring 2020.1

The first segment of Interstate 20 in South Carolina opened in 1966.2

Interstate 20 scenes
Bettis Academy Road south at Interstate 20. Photo taken 05/30/07.
U.S. 1 enters a diamond interchange with Interstate 20, seven miles north of Aiken. This is the first of three meetings between the two highways. Photo taken 06/24/10.
Interstate 20 leads east directly 46 miles to Columbia from U.S. 1 north while U.S. 1 loops north to Batesburg-Leesville before turning eastward to Lexington and West Columbia. Photo taken 06/24/10.
Alpine Road constitutes a local through road between S.C. 12 (Percival Road) and U.S. 1 (Two Notch Road) in suburban Richland County. The north-south road sees a diamond interchange with Interstate 20 just east of its stack interchange with Interstate 77. Motorists taking the westbound ramp from Alpine Road can access either freeway. Photo taken 04/14/12.
The ramp from Alpine Road partitions with a left side ramp onto I-20 west to Columbia and a right side ramp onto Exit 76A to either I-77 north to Rock Hill or south to Fort Jackson. Photo taken 04/14/12.
Sally Hill Road, Southborough Road, Corporation Road and S.C. 340 (Timmonsville Highway) come together at a five-point intersection just south of the Exit 137 diamond interchange with Interstate 20. An I-20 trailblazer was posted at the Sally Hill Road turn onto S.C. 340 north. It has since been replaced. Photo taken 12/15/01.
S.C. 340 (Timmonsville Highway) ventures east from Alexander Crossroads to the final interchange of Interstate 20 east before the junction with I-95 at Florence. Photo taken 12/15/01.

  1. "Tired of driving the I-20 and I-77 construction zones? Here's when they'll be done." The State (Columbia, SC) March 30, 2018.
  2. "Carolina Century: 1960-1979 Interstate System was Boon for some in S.C., but not all." The State (Columbia, SC), December 21, 1999.

Photo Credits:

12/15/01, 05/30/07, 06/24/10, 04/14/12 by AARoads

Connect with:
Interstate 26
Interstate 77
Interstate 95
Interstate 520 - Palmetto Parkway

Page Updated 01-08-2020.

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