 As I @-@ 80 and US 6 approach Adair , the highways curve slightly to the south to bypass the community . There are two interchanges in Adair ; both of the intersecting roads , at one time or another , carried US 6 . CR G30 , the White Pole Road , was the original alignment of US 6 , while CR N54 has not carried US 6 since 1980 . Further east is an interchange with Iowa 25 . About one mile ( 1 @.@ 6 km ) south of the interchange is Freedom Rock . Each year for Memorial Day , the rock is repainted with a patriotic scene by local artist Ray " Bubba " Sorenson II . Near Dexter , I @-@ 80 and US 6 graze the northwestern corner of Madison County . After two miles ( 3 @.@ 2 km ) , the routes enter Dallas County and meet CR F60 , another former alignment of US 6 . 
