 The old alignment of SR 100, now designated SR F-047 (Kirby Road), continues to parallel the Interstate as the highways cross Peak Creek.Near the community of Newbern, I-81 and SR 100 diverge at a diamond interchange that serves as the eastern terminus of SR F-047.SR 100 heads north as Cleburn Boulevard, a four-lane divided highway that passes by the industrial area of Burlington Mills before passing under a rail spur that serves the Radford Army Ammunition Plant to the east.