6 , ▁US   1 3 1 ▁followed ▁I - 1 9 6 ▁east ▁to ▁the ▁northern ▁portion ▁of ▁the ▁business ▁loop ▁at ▁P lain field ▁Avenue ▁and ▁followed ▁P lain field ▁Avenue ▁back ▁to ▁the ▁remainder ▁of ▁its ▁routing ▁north ▁of ▁Grand ▁Rap ids . ▁The ▁other ▁end ▁of ▁the ▁fre ew ay ▁was ▁extended ▁south ▁to ▁M - 4 3 ▁on ▁the ▁west ▁side ▁of ▁Kal am az oo . ▁Tra ffic ▁there ▁is ▁directed ▁along ▁M - 4 3 ▁into ▁dow nt own ▁to ▁connect ▁with ▁the ▁remainder ▁of ▁the ▁highway . ▁ ▁Fre ew ay ▁construction ▁continued ▁through ▁the ▁ 1 9 6 0 s . ▁By ▁the ▁end ▁of ▁ 1 9 6 3 , ▁the ▁southern ▁section ▁of ▁fre ew ay ▁was ▁extended ▁to ▁School craft . ▁The ▁following ▁year , ▁a ▁business ▁loop ▁in ▁Kal am az oo ▁was ▁created . ▁The ▁new ▁loop ▁used ▁a ▁fre ew ay ▁stub ▁on ▁the ▁north ▁and ▁M - 4 3 ▁on ▁the ▁south ▁to ▁connect ▁the ▁main ▁highway ▁to ▁the ▁former ▁routing ▁of ▁US   1 3 1 ▁along ▁West ned ge ▁and ▁Park ▁a ven ues ▁dow nt own . ▁A ▁dis continu ous ▁segment ▁of ▁fre ew ay , ▁south ▁of ▁Cad illa c ▁into ▁Os ce ola ▁County , ▁opened ▁in ▁September ▁ 1 9 6 6 . ▁The ▁fre ew ay ▁was ▁extended ▁north ▁from ▁the ▁Grand ▁Rap ids ▁area ▁through ▁the ▁Com stock ▁Park ▁area ▁in ▁ 1 9 6 6 . ▁That