Sugarloaf Parkway is a locally maintained highway in Gwinnett County. It is mostly expressway, but the easternmost part of it between GA 20 and US 29 is full freeway.
I would think this should be added to the usasf system, especially since the freeway segment is decently long (almost 6 miles), there are three intermediate interchanges along the freeway segment, and the similar nearby Ronald Reagan Parkway is already in the system.