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The state highways were signposted starting in 1919, [31] and on the first maps published on July 1 of that year, the Michigan State Highway Department (MSHD) had applied the M-16 number to Grand River Avenue across the state between Grand Haven and Detroit. [8]
This Interstate Highway segment was the last in the state and completed Michigan's portion of the Interstate Highway System. [75] At the time it was complete, I-69 was concurrent with US 27 from the state line north to the DeWitt area (exit 87) and then concurrent with US 127 to exit 89. [76]
The county-designated highways in Michigan comprise a 1,241.6-mile-long (1,998.2 km) system of primary county roads across the US state of Michigan. Unlike the State Trunkline Highway System , these highways have alphanumeric designations with letters that correspond to one of eight lettered zones in the state.
The 1,241-mile (1,997 km) Interstate Highway network in Michigan was completed in 1992 with the last four miles (6.4 km) of I-69 near the Lansing area. [81] Since the completion of these freeways, a handful of major projects have added to the trunkline system and the end of the 20th and the start of the 21st centuries.
The highway was moved to a new routing between Flint and Lapeer in 1929; the old route was renumbered M-21A. [ 13 ] [ 14 ] All in-city portions of M-21 were transferred to state control in 1931 with the passage of the Dykstra Act of 1931 (PA 131 of 1931).
The first divided highway section was completed in 1952 in Warren, [17] [18] with an additional two miles (3.2 km) completed the following year, completing the divided highway between 12 Mile and 17 Mile roads.
The section along the east side of the city was completed as M-114. A northern leg was added along 3 Mile Road at the same time. [6] By 1945, the northern leg of M-114 was turned back to local control and removed from the highway system. The eastern leg was assigned a Byp. US 131 designation, thereby eliminating the last remaining portion of M-114.
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