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.
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/I-75.svg/40px-I-75.svg.png)
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/US_23.svg/40px-US_23.svg.png)
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.
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/M-28.svg/40px-M-28.svg.png)
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/4/45/M-115.svg/40px-M-115.svg.png)
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.
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Alger_County_H-58.svg/40px-Alger_County_H-58.svg.png)
![](http://webcf.waybackmachine.org/web/20220429175549im_/https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/Michigan_492_Marquette_County.svg/40px-Michigan_492_Marquette_County.svg.png)
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.
The Capitol Loop is a state trunkline highway running through Lansing, Michigan, in the United States that was commissioned on October 13, 1989. It forms a loop route off Interstate 496 (I-496) through downtown near the Michigan State Capitol complex, home of the state legislature and several state departments. The Michigan Department of Transportation (MDOT) has labeled it as Capitol Loop I-496 or CL I-496 on some maps, similar to the Business Loop Interstate nomenclature. However, unlike other business loops in Michigan, it has unique reassurance markers—the signs that serve as regular reminders of the name and number of the highway. It is known internally at MDOT as Connector 496 for inventory purposes. The route follows a series of one-way and two-way streets through downtown Lansing, directing traffic downtown to the State Capitol and other government buildings. Unlike the other streets downtown, the seven streets comprising the Capitol Loop are under state maintenance and jurisdiction.
The loop was originally proposed in 1986 as part of a downtown revitalization effort. Almost from the beginning before the highway was commissioned in 1989, it was affected by controversial proposals. Several suggestions by community leaders to rename city streets in honor of Martin Luther King Jr. were rejected. In the end, Logan Street was given a second name, Martin Luther King Jr. Boulevard, and the original name was eventually dropped. (Full article...)General images
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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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