Map of US highway 27 and family
US 27 is represented by the purple line beginning in Miami FL. The blue lines in Florida and Georgia are designated "Alternate US 27". Its current northern terminus is in Ft. Wayne IN; the red line north from there to St. Ignace MI is the historic extent of US 27 (the segment between Lansing and Grayling MI is now designated US 127).
US 127 is the blue line from Grayling MI to Chattanooga TN. Originally it followed the red line from Somerset MI to Toledo OH.
US 227 (historic) is the red line from Richmond KY to Carrollton (near Bedford).