Michigan State Trunkline Highway System

The State Trunkline Highway System is all the state highways in Michigan. The system is controlled by the Michigan Department of Transportation (MDOT).^[5]

Highway markers for Interstate 75, US Highway 23, and M-28
A map of state trunkline highways in the state of Michigan   Interstates   US Highways   State
System information
Formed:	May 13, 1913 (1913-05-13),[1] signed by July 1, 1919[2]
Length:	9,669 mi[3][4] (15,561 km)
Highway names
Interstates:	Interstate n (I-n)
US Routes:	US Highway n (US n)
State:	M-n
System links
Michigan State Trunkline Highway System Interstate US State Byways