Transportation
Michigan has seven international crossings with Ontario, Canada:
Ambassador Bridge, North America's busiest international border, crossing the Detroit River
Blue Water Bridge, a twin-span bridge (Port Huron, Michigan, and Point Edward, Ontario, but the larger city of Sarnia is usually referred to on the Canadian side)
Canadian Pacific Railway tunnel
Detroit–Windsor Tunnel
International Bridge (Sault Ste. Marie, Michigan, and Sault Ste. Marie, Ontario)
St. Clair River Railway Tunnel (Port Huron and Sarnia)
Walpole–Algonac Ferry (Algonac, Michigan, and Walpole Island First Nation, Ontario)
The Gordie Howe International Bridge, a second international bridge between Detroit and Windsor, is under construction. It is expected to be completed in early 2026.
Michigan only has one major ferry service still in operation with Ontario, the Walpole–Algonac Ferry, after the closures of the Bluewater Ferry and the Detroit–Windsor Truck Ferry.
Michigan is served by four Class I railroads: the Canadian National Railway, the Canadian Pacific Railway, CSX Transportation, and the Norfolk Southern Railway. These are augmented by several dozen short line railroads. The vast majority of rail service in Michigan is devoted to freight, with Amtrak and various scenic railroads the exceptions.
Three Amtrak passenger rail routes serve the state. The Pere Marquette from Chicago to Grand Rapids, the Blue Water from Chicago to Port Huron, and the Wolverine from Chicago to Pontiac. There are plans for commuter rail for Detroit and its suburbs (see SEMCOG Commuter Rail).
Interstate 75 (I-75) is the main thoroughfare between Detroit, Flint, and Saginaw extending north to Sault Ste. Marie and providing access to Sault Ste. Marie, Ontario. The freeway crosses the Mackinac Bridge between the Lower and Upper Peninsulas. Auxiliary highways include I-275 and I-375 in Detroit; I-475 in Flint; and I-675 in Saginaw.
I-69 enters the state near the Michigan–Ohio–Indiana border, and it extends to Port Huron and provides access to the Blue Water Bridge crossing into Sarnia, Ontario.
I-94 enters the western end of the state at the Indiana border, and it travels east to Detroit and then northeast to Port Huron and ties in with I-69. I-194 branches off from this freeway in Battle Creek. I-94 is the main artery between Chicago and Detroit.
I-96 runs east–west between Detroit and Muskegon. I-496 loops through Lansing. I-196 branches off from this freeway at Grand Rapids and connects to I-94 near Benton Harbor. I-696 branches off from this freeway at Novi and connects to I-94 near St. Clair Shores.
U.S. Highway 2 (US 2) enters Michigan at the city of Ironwood and travels east to the town of Crystal Falls, where it turns south and briefly re-enters Wisconsin northwest of Florence. It re-enters Michigan north of Iron Mountain and continues through the Upper Peninsula of Michigan to the cities of Escanaba, Manistique, and St. Ignace. Along the way, it cuts through the Ottawa and Hiawatha national forests and follows the northern shore of Lake Michigan. Its eastern terminus lies at exit 344 on I-75, just north of the Mackinac Bridge.
US 23 enters Michigan at the Ohio state line in the suburban spillover of Toledo, Ohio, as a freeway and leads northward to Ann Arbor before merging with I-75 just south of Flint. Concurrent with I-75 through Flint, Saginaw, and Bay City, it splits from I-75 at Standish as an intermittently four-lane/two-lane surface road closely following the western shore of Lake Huron generally northward through Alpena before turning west to northwest toward Mackinaw City and I-75 again, where it terminates.
US 31 enters Michigan as Interstate-quality freeway at the Indiana state line just northwest of South Bend, Indiana, heads north to I-196 near Benton Harbor, and follows the eastern shore of Lake Michigan to Mackinaw City, where it has its northern terminus.
US 127 enters Michigan from Ohio south of Hudson as a two-lane, undivided highway and closely follows the Michigan meridian, the principal north–south line used to survey Michigan in the early 19th century. It passes north through Jackson and Lansing before terminating south of Grayling at I-75, and is a four-lane freeway for the majority of its course.
US 131 has its southern terminus at the Indiana Toll Road roughly one mile south of the Indiana state line as a two-lane surface road. It passes through Kalamazoo and Grand Rapids as a freeway of Interstate standard and continues as such to Manton, where it reverts to two-lane surface road to its northern terminus at US 31 in Petoskey.
Amtrak Thruway
Barons Bus Lines
FlixBus
Greyhound Lines
Indian Trails
Megabus
Detroit Metropolitan Airport in the western suburb of Romulus, was in 2010 the 16th busiest airfield in North America measured by passenger traffic. The Gerald R. Ford International Airport in Grand Rapids is the next busiest airport in the state, served by eight airlines to 23 destinations. Flint Bishop International Airport is the third largest airport in the state, served by four airlines to several primary hubs. Other frequently trafficked airports include Cherry Capital Airport, in Traverse City, serving the northern Lower Peninsula; Kalamazoo/Battle Creek International Airport, serving the Kalamazoo and Battle Creek region; Capital Region International Airport, located outside of Lansing; and MBS International Airport serving the Midland, Bay City and Saginaw tri-city region. Additionally, smaller regional and local airports are located throughout the state including on several islands.