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Michigan State Trunkline Highway System

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This is a map of highways in the state of Michigan, however not all highways are in the map, nor are they all totally accurate.

This lists all roads designated as Interstates, U.S. Highways and State Highways in Michigan.

Interstates

U.S. Routes

  • U.S. Route 2, from the Wisconsin state line near Ironwood to the Wisconsin state line south of Crystal Falls and from the Wisconsin state line at Iron Mountain to St. Ignace.
  • U.S. Route 8, from the Wisconsin state line near Norway to Norway.
  • U.S. Route 10, from Wisconsin by car ferry at Ludington to Bay City.
  • U.S. Route 12, from the Indiana state line near New Buffalo to Detroit.
  • U.S. Route 16, (decommissioned)
  • U.S. Route 23, from the Ohio state line near Temperance to Mackinaw City.
  • U.S. Route 23 Alternate, (decommissioned) from near Kawkawlin to near Standish in 1967-68 (now an extention of M-13).
  • U.S. Route 24, from the Ohio state line near Erie to Clarkston.
  • U.S. Route 25 (decommissioned)
  • U.S. Route 27, (decommissioned)
  • U.S. Route 31, from the Indiana state line near Niles to Mackinaw City.
  • U.S. Route 33 (decommissioned)
  • U.S. Route 41, from the Wisconsin state line at Menominee to east of Copper Harbor.
  • U.S. Route 45, from the Wisconsin state line south of Watersmeet to Ontonagon.
  • U.S. Route 102 (decommissioned)
  • U.S. Route 112 (decommissioned)
  • U.S. Route 112S, (decommissioned) from US 112 (now US 12) to the Indiana state line on what later became M-205 (now a county road).
  • U.S. Route 127, from the Ohio state line south of Hudson to I-75 south of Grayling.
  • U.S. Route 131, from the Indiana state near White Pigeon to Petoskey.
  • U.S. Route 141, from the Wisconsin state line at Quinnesec to the Wisconsin state line at Iron Mountain and from the Wisconsin state line south of Crystal falls to US 41 near Covington.
  • U.S. Route 223, from the Ohio state line near Temperance to US 12 near Somerset.

State Highways

Note that in Michigan, all state highways (not Interstates and U.S. highways) are identified as "M-nn" as opposed to "Route nn" or "Highway nn." This usage dates from 1918, when Michigan's state trunklines were first signed in the field. The state highway route marker is a diamond with a block letter "M" at the top.

Although "M-nn" outside of Michigan could refer to other state, provincial, local, or national highways, local usage in those areas does not mimic the Michigan usage in most cases. In the United Kingdom, "M" refers to motorways, analogous to freeways in the United States. The "M" in the "M-nn" route designation never refers to "superhighway" or "freeway" status in Michigan, however. "M-routes" (Michigan state trunklines) are designated along eight-lane freeways in urban aras, four-lane rural freeways and expressways, principal arterial highways, lonely two-lane highways in far-flung rural areas, and even a pedestrian trial restricted to bicycle and non-motorized transportation with the exception of emergency vehicles.

No discernible pattern is to be inferred in Michigan's numbering system.

M-1 through M-20

M-21 through M-40

M-41 through M-60

M-61 through M-80

M-81 through M-100

M-101 through M-120

M-121 through M-140

M-141 through M-160

M-161 through M-180

M-181 through M-200

M-201 through M-220

M-221 and above

Business / Connector Routes

Below is a list of the many Business Routes or Connector Routes in Michigan

Interstate Business Routes

U.S. Highway Business Routes

State Highway Business Routes

Connector Routes

Unsigned State Trunklines

County-Designated Highways

See also List of Michigan County-Designated Highways

Unique named highways

Notable freeway and expressway segments in Michigan

Main article: List of expressways in Michigan

Highways featuring unique signage

Other unique road names

This list is incomplete; you can help by adding missing items.

See also

External links

Numbered highways in the United States
National systems
State highways
Other areas
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