[4] Although the Interstate does not connect with it, I-59 parallels the older U.S. Route 11 (US 11) corridor for its remaining length with indirect access via certain interchanges.

For internal Georgia Department of Transportation (GDOT) purposes, I-59 carries the hidden designation of unsigned State Route 406 (SR 406).

The second and final segment with a length of 11.8 miles (19.0 km), connecting Trenton to I-24, was finished in 1971, filling the rest of the route in.

It then curves slightly northwest and reaches its first interchange with Deer Head Cove Road at milepost 4, providing access to Rising Fawn and a small sprinkle of development.

Entering small amounts of development again, I-59 reaches its next interchange with SR 136 (White Oak Gap Road) for downtown Trenton as well as access to the welcome center and Cloudland Canyon State Park.

Of these projects, one of them included the stretch of I-59 from the Alabama state line to Trenton, at a distance of approximately 11.38 miles (18.31 km) was under construction.

Emory C. Parrish, executive assistant to the director, said that the project would be the last link to I-59, part of the route from Birmingham, Alabama, to Chattanooga.

The route was not considered important, but due to the Bureau of Public Roads persuading them, it was required to be built.