The state highway connects Interstate 85 (I-85) with U.S. Route 80 (US 80) in the western part of the county.

Victoryland, a greyhound track and now-closed casino are located immediately off I-85 at its exit with SR 138.

SR 138 begins at exit 22 of I-85 in the western part of Macon County, around the town of Shorter.

Heading east past the diamond interchange with I-85, numerous truck stops, gas stations, fast food restaurants, and small stores line the roadway.

The entire route is in Shorter, Macon County.