1 3 1 ▁approaches ▁the ▁south ▁side ▁of ▁Cad illa c ▁in ▁W ex ford ▁County . ▁At ▁exit   1 7 6 , ▁M - 5 5 ▁leaves ▁a ▁conc urrency ▁with ▁M - 1 1 5 ▁and ▁joins ▁the ▁US   1 3 1 ▁fre ew ay ▁around ▁the ▁east ▁side ▁of ▁Cad illa c . ▁This ▁by pass ▁was ▁built ▁in ▁the ▁early ▁ 2 1 st ▁century ▁and ▁the ▁old ▁routing ▁is ▁now ▁a ▁business ▁loop ▁through ▁dow nt own . ▁M - 5 5 ▁follows ▁the ▁fre ew ay ▁to ▁exit   1 8 0 ▁while ▁US   1 3 1 ▁continues ▁around ▁the ▁east ▁side ▁of ▁Cad illa c ▁and ▁north ▁around ▁the ▁east ▁side ▁of ▁M anton . ▁The ▁lowest ▁fre ew ay ▁traffic ▁counts ▁along ▁US   1 3 1 , ▁ 7 , 4 5 5   c ars ▁and ▁ 7 0 9   tr uck s ▁in ▁ 2 0 0 9 , ▁are ▁on ▁the ▁n ortheast ▁side ▁of ▁M anton , ▁as ▁the ▁tr unk line ▁trans itions ▁back ▁to ▁a ▁two - lane ▁und iv ided ▁highway ▁before ▁meeting ▁the ▁north ▁end ▁of ▁M anton ' s ▁business ▁loop . ▁ ▁The ▁two - lane ▁highway ▁runs ▁through ▁the ▁Pere ▁Mar qu ette ▁State ▁Forest ▁and ▁over ▁the ▁Man iste e ▁River , ▁crossing ▁the ▁sout heast ▁corner ▁of ▁Grand ▁Tra verse ▁County . ▁It ▁meets ▁the ▁southern ▁end ▁of ▁M - 1 1 3 ▁in ▁Wal ton ,