▁time ▁was ▁de comm ission ed ▁and ▁replaced ▁with ▁M - 6 6 . ▁Starting ▁at ▁Six ▁L akes , ▁M - 6 6 ▁turned ▁west ▁along ▁M - 4 6 ▁instead ▁of ▁east ▁and ▁then ▁turned ▁south ▁through ▁St anton ▁and ▁I onia ▁ending ▁north ▁of ▁Battle ▁Creek . ▁The ▁highway ▁between ▁Low ell ▁and ▁Lake view ▁was ▁red es ign ated ▁as ▁M - 9 1 . ▁A ▁minor ▁real ignment ▁in ▁late ▁ 1 9 5 0 ▁removed ▁two ▁ 9 0 ° ▁curves ▁near ▁the ▁Os ce ola – Miss au kee ▁county ▁line ▁and ▁replaced ▁them ▁with ▁a ▁pair ▁of ▁swe eping ▁curves . ▁ ▁The ▁M SH D ▁r er out ed ▁M - 6 6 ▁between ▁Map le ▁Gro ve ▁and ▁Nash ville ▁in ▁mid - 1 9 5 3 . ▁In ▁the ▁changes , ▁M - 7 9 ▁was ▁extended ▁along ▁the ▁new ▁route ▁of ▁M - 6 6 ▁and ▁then ▁over ▁M - 2 1 4 ▁to ▁H ast ings . ▁M - 6 6 ▁was ▁shift ed ▁off ▁Ass y ria ▁Road ▁which ▁was ▁turned ▁back ▁to ▁local ▁control . ▁Another ▁real ignment ▁in ▁ 1 9 5 4 ▁shift ed ▁M - 6 6 ▁to ▁the ▁modern ▁routing ▁between ▁the ▁M - 4 3 ▁conc urrency ▁term ini , ▁removing ▁M - 4 3 / M - 6 6 ▁from ▁a ▁section ▁of ▁M - 5 0 ▁in ▁the ▁process . ▁The ▁final ▁section ▁gra vel ▁section ▁of ▁M - 6 6