Portal:Michigan highways
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.
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US Route 223 or US Highway 223 (US 223) is a diagonal (northwest–southeast) United States Numbered Highway lying in the states of Michigan and Ohio. The southernmost section is completely concurrent with the US 23 freeway, including all of the Ohio segment. It connects US 23 in the south near Toledo, Ohio, with US 127 south of Jackson, Michigan. The highway passes through farmland in southern Michigan and woodland in the Irish Hills. Including the concurrency on the southern end, US 223 is 46.34 miles (74.58 km) in total length.
The highway designation was created in 1930 out of the southern end of US 127. Three sets of reroutings through Adrian have resulted in the creation of two different business loops through the city. A change proposed in the 1960s and implemented in the 1970s shifted the southern end of US 223 to replace M-151 and then run along the US 23 freeway between Whiteford Township, Michigan, and Sylvania, Ohio. Since the 1980s, US 223 no longer reaches Toledo, instead feeding into the freeway system for the city. Changes proposed and enacted into law in the 1990s would upgrade the highway as an Interstate Highway. Congress has designated this corridor as part of Interstate 73 (I-73), although neither state intends to complete the freeway at this time. (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. -
H-13 during winter -
Map of the pre-statehood Indian trails -
A-2 in Allegan County south of Holland -
M-39 bridge over the River Rouge in Dearborn -
M-87 on November 1, 1956 -
Construction along I-96 for the interchange with M-231 in July 2013 (from Michigan State Trunkline Highway System) -
Welcome sign along US 8 -
M-553 approaching Glass' Curve south of Marquette -
Milemarker used in 1922 for M-14 -
Planning map for the Detroit area freeways from 1955 -
Interstate HighwaysOther freewaysMiscellaneous expressways -
Map of the zone system -
Dead Man's Curve along the Marquette–Negaunee Road shown in 1917 with its hand-painted centerline, the first in the nation -
M-121 in Jenison -
H-58 west of Grand Marais -
Junction between M-28 and M-178 south of Munising before 1941 -
Exit 254 on I-75 south of Grayling
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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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