MileCheckMichigan is two peninsulas stitched together by one bridge, and one interstate does most of the stitching. Here's how mile markers work across the state — from Detroit to the Soo — where they matter most, and how to see your exact one plus live MDOT conditions in real time.
How Michigan numbers its highways
Michigan's mileposts count up from the south or west edge of the state and rise as you head north or east. The backbone is I-75, which runs about 395 miles from the Ohio line through Detroit, up the middle of the Lower Peninsula, across the Mackinac Bridge, and on to Sault Ste. Marie. Michigan also has its own signing convention for state highways: the M-routes. M-22 hugging the Lake Michigan shore and M-28 running the length of the Upper Peninsula are M-routes, not US highways — a Michigan original. Mile marker data for every Michigan highway is bundled into MileCheck and works offline.
The corridors people actually drive
- I-75 is the whole-state road: Ohio line, Detroit, Flint, Grayling, the Mackinac Bridge, Sault Ste. Marie.
- I-94 crosses the bottom of the state from the Indiana line through Kalamazoo, Ann Arbor, and Detroit toward Port Huron.
- I-96 links Detroit and Grand Rapids; US-131 runs north-south up the west side.
- M-28 is the Upper Peninsula's main east-west road, and US-2 runs the UP's southern shore.
Where mile markers matter most: the bridge and the north
The Mackinac Bridge sits around mile marker 339 on I-75 — the only interstate crossing of the Straits, and a span famous for high-wind restrictions and escorts. North of the bridge, and across most of the Upper Peninsula, towns get sparse and exits get far apart. When something goes wrong up there, the mile marker is often the only precise location you have to give.
UP winters and deer season
Michigan hazard driving comes in two flavors. In winter, lake-effect snow off Superior and Michigan buries the Upper Peninsula and the northern Lower Peninsula — M-28 and US-2 can go from clear to whiteout inside a few miles, and closures are announced by route and milepost. In fall, deer season is the other story: dawn and dusk collisions are a fact of life on Michigan highways, and when one happens, the mile marker is what you give the county dispatcher.
Live MDOT alerts, in one place
MileCheck pulls live road alerts straight from MDOT: closures, crashes, and construction, tied to the mile marker and direction so you can see what's ahead of you on your route — whether that's I-94 through metro Detroit or a lonely stretch of M-28.
Everyday and emergency
Whether you're heading up north on a Friday, crossing the bridge into the UP, or reporting a deer strike at dusk, the mile marker is the location Michigan's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, on your phone and on CarPlay or Android Auto — even where the cell signal drops, which in the UP is often.
Keep reading
Nearby state guides: Indiana · Ohio · Wisconsin
Michigan drawbridges: every movable bridge, its opening rules →
Essentials: What to tell 911 on the highway · How to find your mile marker · Browse the live mile marker map · All 50 states