Interstate 75 in Michigan

Interstate 75 in Michigan.
Interstate 75 in Michigan is a part of the Interstate Highway System that runs 396 miles (637 km) generally northward from Ohio to the Canadian border in Sault Ste. Marie. It passes near Lake Erie and through Detroit, Pontiac and Bay City, Michigan, crossing the Mackinac Bridge (pictured) in the Straits of Mackinac between Lake Michigan and Lake Huron. Within the state, the Interstate shares parts of its route with circle tours around four of the five Great Lakes, and spawns four auxiliary Interstates. Native American trails spanned the state along the general path of the modern freeway; after statehood, several of these were converted into plank roads that later became some of the first state highways. Interstate construction in Michigan started in 1957, signs went up in 1959, and the last section was opened on November 1, 1973. South of Michigan, Interstate 75 continues for 1,391 miles (2,239 km), terminating in Miami, Florida.