It seems a new route was created last year, signed beginning sometime between May and October 2023, along Mountain Industrial Blvd in Tucker.
West end is at US29/GA8:
Street View linkEast end is at US78/GA410:
Street View linkEven though it runs north/south, it is
signed east/west.
Points for the relevant intersections already exist on US29/GA8 (both JimCarBlvd), GA236 (MouIndBlvd), GA410 (4), and US78 (GA410(4)).