michigan highway mile long state trunkline highway thumb region state michigan highway runs junction west unincorporated community intersection east trunkline runs rural agricultural areas outside villages communities serves designated 1930s extended 1940s truncated 1990s route description begins junction road west known highway heads east agricultural fields east roadway crosses branch line continues east farm fields county line road road changes road trunkline remains easterly track community village follows crossing junction highway turns north main crosses rail line second time exit town main street runs northward farm fields mile course turns eastward highway passes village beach street crossing rail line final time west town resumes terminates intersection road maintained michigan_department_of_transportation mdot like state highways michigan maintenance responsibilities department tracks volume traffic uses roadways jurisdiction volumes expressed metric called annual average daily traffic statistical calculation average daily number vehicles segment roadway mdot surveys showed highest traffic levels vehicles daily near lowest count vehicles day west section listed national_highway_system network roads important country economy defense mobility history state highway system current early highway extended east northeasterly end end year paved extended northward supplanted designation area north highway truncated current form result major intersections
M-138 (Michigan highway)