The U.S. state of Michigan has used several highway designated as spur routes to connect a highway with a town. These former spur routes listed below predate the usage of business route designations and are all decommissioned.
M-162 was a state highway that served as a spur route from M-94 (now M-28 into AuTrain in Alger County from 1935 to 1939.[1] It would follow the route of today's H-03.
M-164
M-176 was a state highway that served as a spur route from M-19 into Snover in Sanilac County in the 1930s.[1]
M-166 was a state highway that served as a spur route from M-21 into Lyons in Ionia County in the 1930s. It was later extended east and south to US 16 (now former BS I-96) in Portland.[1]
M-167
M-167 was a state highway that served as a spur route from M-21 into Saranac in Ionia County in the 1930s.[1]
M-173 was a state highway that served as a spur route from M-44 into Orleans in Ionia County in the 1930s. It was also the last designation applied along a route connecting the Ann Arbor Railroad ferry docks to US 41 from 1939 to 1972.[1]
M-174
M-174 was a state highway that served as a spur route from US 112 (now US 12 into Buchanan in Berrien County in the 1930s. The designation was also applied to the portion of Logan St. in Lansing from Grand River Ave. to the Ingham/Clinton county line until the early 1970s.[1]
M-177 was a state highway that replaced the routing of M-46 (along Michigan Ave.) into St. Louis from US 27/M46 to US 27A (current BUS US 127) in Alma until 1939.[1]
M-178
M-178 was a state highway that served as a connector route from M-94 in Munising, Michigan to M-28 at Wetmore in Alger County in the 1930s.[1] At this time, M-28 ran along M-94's current routing, while M-94 continued north from Shingleton to Van Meer along the current routing of H-15. From there M-94 turned to Munising and eventually AuTrain along the current H-58 and the current routing of M-28. In between M-28 and M-94, there existed a one-mile connector designated M-178. In 1941, M-28 and M-94 were moved to their current routings, eliminating M-178.
M-180
M-180 was a state highway that served as a spur route from US 41 to the Ann Arbor Railroad ferry docks in Menominee from 1933 until late 1935.[1]
M-208 was a state highway that served as a spur route from US 27 (current BL I-75) to the "Wakeley Bridge" in Crawford County in the 1930s. When the connection from the bridge to M-72 at Eldorado was completed, M-72 was extended over M-208, and M-208 was deleted.[1]
M-210
M-210 served as a spur route through Pewamo in the 1930s. Motorists traveling on M-21 could get on M-210 to go through Pewamo and return to M-21 on the other side of the town, or stay on M-21 and go around the town.
M-214
M-214 was a state highway that served as a connector route near Nashville to Vermontville from 1934 until 1953. It was a formerly a section of M-79 until M-79 was rerouted. At the time, M-66 in Ionia County was M-14. It was lated scaled back to downtown Nashville, leaving a 3-mile connector route between M-79 and M-14. The route survived the redesignation of M-14 in 1941, but it was replaced by a reouting of M-79 in 1953.[1]
M-219 was a state highway that served as a spur route from US 2 at Manistique in Schoolcraft County, Michigan, United States from around 1935 until 1966. It existed to connect the Ann Arbor Railroad carferry docks to US-2 and the state highway system.[1]
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