▁dow nt own ▁Battle ▁Creek ▁designated ▁as ▁I - 1 9 4 . ▁A ▁section ▁of ▁the ▁highway ▁immediately ▁south ▁of ▁I - 9 4 ▁is ▁an ▁express way , ▁a ▁type ▁of ▁divided ▁limited - access ▁highway , ▁while ▁the ▁section ▁along ▁I - 1 9 4 ▁is ▁a ▁full ▁fre ew ay ; ▁otherwise ▁M - 6 6 ▁is ▁a ▁two - lane ▁rural ▁highway . ▁Two ▁sections ▁are ▁listed ▁on ▁the ▁National ▁Highway ▁System . ▁ ▁The ▁first ▁usage ▁of ▁the ▁M - 6 6 ▁design ation ▁dates ▁back ▁to ▁around ▁July ▁ 1 , ▁ 1 9 1 9 ▁with ▁the ▁rest ▁of ▁the ▁original ▁state ▁highway ▁system . ▁At ▁the ▁time , ▁the ▁highway ▁only ▁extended ▁between ▁Low ell ▁and ▁Lake view , ▁a ▁route ▁now ▁covered ▁by ▁M - 9 1 . ▁The ▁highway ▁has ▁been ▁length ened ▁in ▁a ▁series ▁of ▁extensions ▁north ▁and ▁south ▁starting ▁in ▁ 1 9 2 5 . ▁A ▁r er out ing ▁in ▁ 1 9 4 4 – 4 5 ▁removed ▁M - 6 6 ▁from ▁its ▁original ▁ 1 9 1 9 ▁routing ▁to ▁replace ▁another ▁highway ▁south ▁of ▁Six ▁L akes , ▁the ▁change ▁that ▁spawn ed ▁M - 9 1 . ▁The ▁last ▁big ▁extension ▁in ▁ 1 9 6 5 ▁resulted ▁in ▁the ▁modern ▁trans - pen ins ular ▁highway ▁route . ▁The ▁last ▁modifications ▁were ▁shorter ▁r er out ings ▁in ▁the ▁ 1 9 7 0 s . ▁ ▁Route ▁description ▁M -