2 ▁follows ▁US   1 3 1 ▁for ▁a ▁half ▁mile ▁( 0 . 8   km ) ▁near ▁the ▁community ▁of ▁El mi ra . ▁As ▁it ▁continues ▁farther ▁north ▁US   1 3 1 ▁enters ▁the ▁Mack ina w ▁State ▁Forest . ▁Here , ▁MD OT ▁has ▁calculated ▁the ▁lowest ▁average ▁daily ▁traffic ▁counts ▁of ▁all ▁on ▁US   1 3 1 : ▁ 5 , 1 1 4   c ars ▁and ▁ 4 4 8   tr uck s ▁in ▁ 2 0 0 9 . ▁The ▁highway ▁passes ▁through ▁rural ▁Char le vo ix ▁County ▁where ▁the ▁terrain ▁has ▁many ▁rolling ▁hills ▁and ▁begins ▁to ▁descend ▁to ▁Lake ▁Michigan . ▁As ▁the ▁highway ▁enters ▁the ▁southern ▁section ▁of ▁the ▁city ▁of ▁Pet os key ▁it ▁runs ▁along ▁Spring ▁Street ▁passing ▁ret ail ▁establish ments ▁and ▁the ▁O da wa ▁Cas ino , ▁owned ▁by ▁the ▁Little ▁Tra verse ▁Bay ▁Indian ▁Res ervation ▁of ▁the ▁O da wa ▁Indians . ▁At ▁the ▁northern ▁termin us ▁of ▁US   1 3 1 , ▁US   3 1 ▁turns ▁off ▁Char le vo ix ▁Avenue ▁and ▁follows ▁Spring ▁Street ▁to ▁the ▁north . ▁ ▁Services ▁ ▁MD OT ▁oper ates ▁ 6 7   rest ▁areas ▁and ▁ 1 4   wel come ▁cent ers ▁in ▁the ▁state , ▁all ▁named ▁in ▁honor ▁of ▁retired ▁department ▁employees , ▁although ▁in ▁some ▁cases ▁an ▁hon ore e ' s ▁name ▁may ▁be ▁dropped ▁from ▁the ▁rest ▁area . ▁E ight ▁of ▁these