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The first of these revised assignments were shown on the 1971 state highway map; A-2 retained its number but B-1 was renumbered to H-40 in the Upper Peninsula. [6] Earl Rogers, the engineer-director of the County Road Association of Michigan stated at the time that the county road commissions would gradually phase in signage over the coming years.
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MDOT assigns the numbers for a parallel system of county-designated highways in the state; the numbers are assigned in a grid system by the department. These highways, while signed from connecting trunklines and shown on the official MDOT map, are maintained by the various counties.
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 roadways in Marquette County fall into one of three general classifications: state trunklines, county roads or city streets. The Michigan Department of Transportation (MDOT) maintains two categories of trunklines that run through the county: US highways and regular state trunklines. There have been 13 state trunkline highway designations ...
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 Michigan Department of Transportation (MDOT) is a constitutional government principal department of the US state of Michigan. The primary purpose of MDOT is to maintain the Michigan State Trunkline Highway System which includes all Interstate, US and state highways in Michigan with the exception of the Mackinac Bridge .
MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the U.S. Highways in Michigan.The numbering for these highways is coordinated through AASHTO, [6] an organization composed of the various state departments of transportation in the United States. [7]