michigan highway signed state trunkline state michigan served spur route originally designated early 1930s hospital closed roadway removed state maps remains state maintenance unsigned trunkline listed route description old begins state hospital runs north northwesterly field property road passes houses area curves country farm road turning northward trunkline follows road township trunkline follows east northeasterly past residential subdivision old turns east running township line crossing city interchange unsigned trunkline crosses freeway trunkline runs residential subdivisions turns northward michigan avenue half mile trunkline terminates intersection downtown highway state jurisdiction maintained michigan_department_of_transportation mdot department traffic surveys showed average vehicles highway daily vehicles day near terminus highest lowest counts highway respectively section old listed national_highway_system network roads important country economy defense mobility history opened september treat adult patients tuberculosis children later treated starting hospital handled patients mental illnesses later facility operated september closed building finally demolished years designated began hospital ran junction highway modern hospital abandoned trunkline designation remained road serving field designation appeared official state maps highway remains unsigned trunkline major intersections entire highway
M-155 (Michigan highway)