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Three-legged highway in Mackinaw City: 1928 [55] 1957 [89] Connected the State Highway Ferry Docks with the Fort Michilimackinac State Historic Park and US 31: M-108: 1.069: 1.720 I-75 near Mackinaw City: Michigan Welcome Center in Mackinaw City 1960 [90] 2010 [91] M-109: 6.831: 10.993 M-22 near Empire: M-22 in Glen Arbor
The State Trunkline Highway System consists of all the state highways in Michigan, including those designated as Interstate, United States Numbered (US Highways), or State Trunkline highways. In their abbreviated format, these classifications are applied to highway numbers with an I -, US , or M - prefix, respectively.
The north–south highways range from the low 20s into the 40s. There are also three three-digit highways numbered in the 100s and one in the 200s as branches of related two-digit highways. [8] In Michigan, the US Highway System covers about 2,300 miles (3,701 km) of mainline highways and another 160 miles (257 km) of special routes. [3]
The Interstate Highways in Michigan are the segments of the national Dwight D. Eisenhower System of Interstate and Defense Highways [3] that are owned and maintained by the U.S. state of Michigan, [4] totaling about 1,239 miles (1,994 km). [2] The longest of these, Interstate 75 (I-75), is also the longest highway of any kind in the state. [5]
The State Trunkline Highway System of the US state of Michigan is a network of roads owned and maintained by the Michigan Department of Transportation (MDOT). The most prominent of these roads are part of one of three numbered highway systems in Michigan: Interstates Highways, US Highways, and the other State Trunklines.
List of state trunkline highways in Michigan; 0–9. M-1 (Michigan highway) M-3 (Michigan highway) M-5 (Michigan highway) M-6 (Michigan highway) M-8 (Michigan highway)
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.
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