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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 ...
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. The system uses eight lettered zones which are divided by major state highways. Each county road in the system is designated with the zone letter followed by a number.
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]
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: c. 1929 [24] current Leelanau Scenic Heritage Route; runs through the Sleeping Bear Dunes National Lakeshore: M-110: 1.715: 2.760 US 31 in Parkdale: Orchard Beach State Park
In 2011, MDOT raised the speed limit along the expressway section in Delta County from 55 to 65 mph (89 to 105 km/h), although the speed limit for trucks remained 55 mph (89 km/h) [19] until 2017. That year the highway's speed limits were raised to 65 mph (105 km/h) between Wakefield and Iron River as well as between Rapid River and St. Ignace ...
The road was built to a standard of 20 ft (6.1 m) and between 7–9 in (17.8–22.9 cm) thick. The current standard at the time was 16 ft (4.9 m) wide and 6 in (15.2 cm) thick. [ 15 ] The 1920s were also busy for Michigan highways as Michigan developed the yellow-line center line to indicate no-passing zones for sight-restricted hills and curves.
Detroit Northern Suburbs and Oakland County (Map) (Fall 1976–77 ed.). 1 in:0.7 mi / 1 in:0.1 km. Falls Church, VA: American Automobile Association. OCLC 49819797 .
M-8 is a 5.5-mile (8.9 km) state trunkline highway in the U.S. state of Michigan lying within the cities of Detroit and Highland Park.Much of it is the Davison Freeway, the nation's first urban depressed freeway, which became a connector between the Lodge and the Chrysler (Interstate 75, I-75) freeways.