North and South Marietta Parkway form a ring road in Marietta, Georgia that was once designated as Georgia State Route 120 Loop (SR 120 Loop) before route realignments in 2007. The full loop is approximately in circumference and has an interchange with Interstate 75 (I-75) twice, once on the north side of Marietta and once on the south side. The southern segment of the road is designated as a part of SR 120 and the northern segment forms SR 120 Alternate (SR 120 Alt.). SR 5 is concurrent with SR 120 Alt. until the intersection with SR 120, and then with SR 120 for a short distance before continuing south. Route description History SR 120 Loop was built over an approximately 20-year span from 1967 to 1989. The first sections complete and open to traffic extended east of US 41 and included the interchanges with then-new I-75, and with mainline SR 120. While the northern part went through what is still farmland , the southern part went through existing neighborhoods, destroying several homes and cutting-off several streets, much like I-75 had done previously. Initially, mainline SR 120 followed what is now the northern part of the loop between Roswell Road and US 41: a move that resulted in the removal of the portion of SR 120 from US 41 at the Big Chicken to the eastern SR 120 Loop interchange. This was changed in the early 1970s to the configuration still known to locals today. The northern portion of the Loop is distinct in that it ended at a partial diamond interchange at US 41 (then SR 3E, now SR 3), with the roadway built-up for a future full interchange. Work did not commence again on the remainder of the highway until the late 1970s. Work to upgrade Clay Street from US 41 to SR 360 (Powder Springs Street) included a relocation of part of the street to an underpass beneath the Louisville and Nashville Railroad (now CSX, originally Western and Atlantic Railroad). When work was completed, it finished the southern half of the route and the highway was extended. Clay Street would later be renamed South Marietta Parkway with exception to Old Clay Street, which remains as a residential street connecting the Loop to SR 5 (Atlanta Street). Northwest of Manget Street, the highway went diagonally through existing neighborhoods, again destroying several homes. Atlanta Street was severed, but Atlanta