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The first state road agency, the Michigan State Highway Department (MSHD), was created on July 1, 1905. At first the department administered rewards to the counties and townships for building roads to state minimum specifications. In 1905, there were 68,000 miles (110,000 km) of roads in Michigan.
Part of Dix–Toledo Highway; labeled "I-75 connector" on state maps; previously part of US 25 and later Connector 3 [234] Connector 25: 0.265: 0.426 BL I-69/BL I-94 in Port Huron: M-25 in Port Huron 1973 [240] current Labeled "I-94 connector" on state maps; previously part of US 25 [240] and later Connector 13 [234] Connector 30: 0.629: 1.012
MDOT is the agency responsible for the day-to-day maintenance and operations of the State Trunkline Highway System, which includes the Interstate Highways in Michigan.. These highways are built to Interstate Highway standards, [6] meaning they are all freeways with minimum requirements for full control of access, design speeds of 50 to 70 miles per hour (80 to 113 km/h) depending on type of ...
After nearly a decade of efforts, the first two test highways were designated, one each in the Lower and Upper peninsulas of the state and included on the 1970 state highway map. The system was created and expanded in scope c. October 5, 1970, after it was approved by the County Road Association of Michigan and the State Highway Commission.
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]
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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.
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.