4 ▁from ▁Car roll ton ▁to ▁Villa ▁Rica . ▁By ▁the ▁end ▁of ▁the ▁third ▁quarter ▁of ▁ 1 9 2 1 , ▁SR   1 6 ▁was ▁designated ▁from ▁the ▁Alabama ▁state ▁line , ▁west ▁of ▁Bow don ▁to ▁Car roll ton . ▁By ▁late ▁ 1 9 2 6 , ▁SR   1 6 ▁and ▁SR   3 4 ▁were ▁red es ign ated ▁as ▁a ▁southern ▁branch ▁of ▁SR   8 . ▁In ▁ 1 9 2 7 , ▁US   7 8 ▁split ▁into ▁two ▁divided ▁routes , ▁with ▁US   7 8 S ▁being ▁designated ▁from ▁He fl in ▁to ▁Villa ▁Rica , ▁via ▁Bow don ▁and ▁Car roll ton , ▁on ▁the ▁southern ▁branch ▁of ▁SR   8 . ▁In ▁ 1 9 2 8 , ▁Alabama ▁State ▁Route   4 ▁( SR - 4 ) ▁was ▁designated ▁along ▁US - 7 8 N , ▁while ▁SR - 4 6 ▁was ▁designated ▁along ▁US - 7 8 S . ▁By ▁ 1 9 3 2 , ▁US   7 8 S / SR   8 ▁were ▁p aved ▁from ▁Car roll ton ▁to ▁just ▁south west ▁of ▁Villa ▁Rica . ▁By ▁the ▁end ▁of ▁ 1 9 3 4 , ▁US   7 8 S / SR   8 ▁were ▁p aved ▁from ▁the ▁Alabama ▁state ▁line ▁to ▁a ▁point ▁near ▁Bow don . ▁By ▁November ▁ 1 9 3 4 , ▁US   7 8 S ▁was ▁red es ign ated ▁as ▁US   7 8