They continue north through rural Giles County before having a junction with US 64 before entering Pulaski.

US 31/SR 7 then leave Pulaski and goes north to the community of Waco, just west of Lynnville, and meets the western end of SR 129.

At the intersection with Smith Avenue, SR 7 Truck curves west onto Austin Whitt Road.

The route ends at SR 7 on the Tennessee side north of the railroad underpass near the state line.

The road exists primarily to allow tall trucks to bypass the low underpass.