History
I-520 was constructed in stages, with the first opening in 1980 between I-20 in Augusta and Doug Barnard Parkway (exit 10). The section between Doug Barnard Parkway (exit 10) and Laney-Walker Boulevard (exit 16) opened in July 1998. On June 22, 2004, the section between Laney-Walker Boulevard (exit 16) and US 1/US 78/US 278 (exit 17) opened to traffic, with I-520 now in the state of South Carolina. Phase 2 of the Palmetto Parkway stretching from Exit 17 to I-20 in North Augusta, South Carolina opened on December 17, 2009. With the completion of this final stretch I-520 is a loop from I-20, violating the numbering standard for Interstates, though existing in two states.
Read more about this topic: Interstate 520
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