SR320 is known as East Brainerd Road its entire length, and begins at an intersection with Lee Highway (US11/64/SR2) near the Chattanooga Metropolitan Airport. From here SR320 travels eastward as a two lane road to traverse the I-75 Exit3 interchange, where it widens to five lanes, including a center turn lane.[2] SR320 continues eastward through the community of East Brainerd, before ending at a four-way intersection with SR321 just south of Collegedale.[3][4] Although the state route designation ends at this point, a county maintained road also labeled as East Brainerd Road continues east to SR317 in Apison, and some maps show this portion as part of SR320.
History
The interchange between I-75 and SR320 was originally a full cloverleaf interchange. The loop ramps on southbound I-75 were removed as part of project between late 1998 and early 2001 that reconfigured the interchange between I-75 and nearby SR153 and moved the southbound off-ramp from I-75 and SR320 north of the SR153 southbound merge, eliminating a hazardous curve and weaving motion.[5][6][7]
In 2013, the northbound off-ramp from I-75 onto SR320 eastbound was reconfigured from a direct merge into SR320 into a signalized with this route, eliminating a weaving motion and providing two right turn lanes.[8]
After years of planning, TDOT began work on a project to widen the section between east of Graysville Road and east of Bel-Air Road from two to five lanes in early 2015.[9][10] Initially slated for completion in June 2017, the project ran into multiple delays caused by utility relocation complications.[11] The next phase will expand the road to five lanes from east of Bel-Air Road to east of SR321, and include improvements to SR321 through the intersection between the two routes.[12][13]
↑Tennessee Department of Transportation (2018). Tennessee's Official Transportation Map [back](PDF) (Map) (2017ed.). Nashville: Tennessee Department of Transportation. §Chattanooga inset. Retrieved September 28, 2017.
↑"I-75 Project Let To Contract" (Press release). Nashville: Tennessee Department of Transportation. July 24, 1998. Archived from the original on August 24, 2000. Retrieved December 29, 2025.
