Michigan Highways
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. Other systems of roads are operated by the 83 counties in the state as well as each city.
Interstate Highways and US Highways are assigned at the national level. Interstate Highways are numbered in a grid—even-numbered highways are east–west highways (with the lowest numbers along Mexico and the Gulf of Mexico), and odd-numbered highways are north–south highways (with the lowest numbers along the Pacific Ocean). US Highways are also numbered in a grid—even numbered for east–west highways (with the lowest numbers along Canada) and odd numbered for north–south highways (with the lowest numbers along the Atlantic Ocean). For this reason, mainline (two-digit) Interstate Highways in Michigan all have numbers above 69 and mainline US Highways all have numbers below 45. Three-digit Interstate and U.S. Highways, also known as "child routes," are branches off their main one- or two-digit "parents". The Interstate and US Highways are maintained by MDOT. Interstate 75 (I-75) and US Highway 23 (US 23) are the longest examples in the state.
State Trunklines are the other state highways maintained by MDOT. These highways are completely owned and maintained by the state. Michigan highways are properly referred to using the M and never as "Route 28" or "Highway 115", but as M-28 or M-115. The marker used for state trunklines is a diamond with a block-letter "M" at the top. Roads that are maintained by the state but not assigned a state trunkline designation carry an unsigned highway designation.
County-Designated Highways are assigned numbers in a zone system by MDOT, but maintained by the counties. Each zone is indicated by a letter A–H which is followed by a number based on a grid inside that zone. Each county also maintains any other roadway that is not a state trunkline or a city street. The numbering and signing practices vary from county to county, as does the size of each county's system. Numerical designations typically do not carry over from one county to the next; a CDH that crosses county lines keeps its designation in each county however. County road designations are typically abbreviated "CR" or "Co Rd" followed by the number, and CDHs are abbreviated to just their letter and number assignment.
Recognized content - 
US Highway 127 (US 127) is a part of the United States Numbered Highway System that runs from Chattanooga, Tennessee, to the Lower Peninsula of Michigan. In Michigan, it is a state trunkline highway that runs for 212.2 miles (341.5 km), entering from Ohio south of Hudson and ending at a partial interchange with Interstate 75 (I-75) south of Grayling. US 127 is the primary route connecting Lansing and Central Michigan to Northern Michigan and the Mackinac Bridge. From the south side of Jackson northerly, it is mostly a four-lane freeway. A notable exception is a 16-mile (26 km) stretch from north of St. Johns to just south of Ithaca, where the highway is built as an expressway and speed limits are lower. South of Jackson to the state line, the trunkline is a two-lane, undivided highway with access from adjacent properties.
The highway was first designated on November 11, 1926, along a series of existing state highways from Lansing southward toward Toledo. In 1930, the southern end was rerouted south of Somerset in rural northwestern Lenawee County to a course that ran directly south to the Ohio state line; the remainder was renumbered US 223. Starting in the 1950s, the highway was reconfigured to bypass Mason and other communities, converting US 127 into a freeway from Jackson to the Lansing area by the mid-1970s. When the Michigan Department of Transportation (MDOT) successfully petitioned the American Association of State Highway and Transportation Officials (AASHTO) in 1999 to remove US 27 from the state, US 127 was to be extended northward from Lansing to Grayling as the replacement designation. This change was made in 2002, resulting in the current configuration of the highway in Michigan. The United States Congress has designated an additional Interstate Highway, to be part of I-73, that would replace most or all of US 127 through Central and Southern Michigan, but any plans by MDOT to complete this highway were cancelled in 2001. (Full article...)
General images
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Grand River Avenue, once a part of M-16 and later US 16, was originally an Indian trail converted as a plank road before becoming a state highway. -
M-553 approaching Glass' Curve south of Marquette -
H-58 west of Grand Marais -
Interstate HighwaysOther freewaysMiscellaneous expressways -
Exit 254 on I-75 south of Grayling -
Map of the pre-statehood Indian trails -
A-2 in Allegan County south of Holland -
M-121 in Jenison -
Welcome sign along US 8 -
Planning map for the Detroit area freeways from 1955 -
Dead Man's Curve along the Marquette–Negaunee Road shown in 1917 with its hand-painted centerline, the first in the nation -
M-87 on November 1, 1956 -
Junction between M-28 and M-178 south of Munising before 1941 -
Milemarker used in 1922 for M-14 -
Construction along I-96 for the interchange with M-231 in July 2013 (from Michigan State Trunkline Highway System) -
M-39 bridge over the River Rouge in Dearborn -
Map of the zone system -
H-13 during winter
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Topics
State Trunkline System, overview of the system
- Interstates Highways in the state
- US Highways in the state
- State Trunklines
- County-Designated Highways in the state
- Pure Michigan Byways, a system of scenic, historical or recreational highways in the state
- Great Lakes Circle Tour
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