michigan highway north south state trunkline highway lower_peninsula state michigan runs miles central region state connecting highway near rural near community roadway connects smaller communities running woodlands state national forest areas segments run sections county boundaries highway forms component business loop village highway designated late 1910s extended farther south today ended short current northern terminus southern end added state highway length roughly current southern terminus northern end simultaneously extended time revisions highway routing 1940s northern extension reversed reinstated course changed opening different freeways area 1960s 1970s extension supplanted designation north route description begins miles northeast interchange rural highway runs north woodlands trunkline enters community turns northwest cross section known continuing northwesterly road runs section lake turns northerly north runs farm fields approaches county seat highway runs southwestern outskirts town near golf course approaches junction merges runs concurrently eastward town cedar avenue street turns north near airport continues northward town farm country highway turns westward road past southern terminus county road northern near crossing turns north west highway returns northerly course turns run road runs county line roadway angles northwest briefly cutting extreme northeast corner highway crosses southern portion county road runs forest management unit approaches community turns northeasterly runs eastern shore highways separate eastern edge town turns northward intersecting northern end continues north parallel interstate near crosses exit south north freeway interchange route combined runs north near conservation airport turns northeasterly town middle turns northwest old road continues northeasterly line lake state railway highway continues independently northwest river town turns east county line section county line forms southern boundary curves northeast county line national forest territory meets second time junction merges roads run north junction west intersection continues north terminates rural maintained michigan_department_of_transportation mdot like state trunkline highways maintenance responsibilities department tracks traffic volumes roads jurisdiction measurement called annual average daily traffic aadt metric level traffic roadway segment average day year mdot calculated vehicles section concurrency highest traffic levels lowest aadt found highway surveys commercial traffic varied trucks daily trucks day north section listed national_highway_system network roads important country economy defense mobility history july designated routing ran west later highway south realigned run south new terminus new late routing north redesignated highway junction south extended time north end extended end northern extension scaled new alignment opened early extended north turned northwesterly end south completion freeways state shifted termini slightly southern terminus moved north mile new freeway northern terminus shifted north mile new freeway completed freeway segment area modern temporary assignment moved freeway remainder freeway completed rerouted run northeasterly routing highway existed routing northwestern major intersections
M-18 (Michigan highway)