MileCheckThree major interstates cross at Atlanta, and half the East Coast funnels through Georgia on the way to Florida. Here's how mile markers work across the state, the quirk in how GDOT names its roads, and how to see your exact milepost plus live GDOT conditions in real time.
How Georgia numbers its highways
Georgia's mileposts count up from where a route enters the state on the south or west and climb as you head north or east. On I-75, mile 0 sits at the Florida line and the numbers run to roughly 355 at the Tennessee line. Here's the quirk: GDOT labels nearly everything it maintains as a state route — even US highways carry hidden SR numbers in official data, so a road you know as a US highway may show up in DOT feeds under a state route name. MileCheck normalizes those names so alerts line up with the road you're actually driving, and mile marker data for every Georgia highway is bundled in and works offline.
The corridors people actually drive
- I-75 runs the length of the state, Florida line to Tennessee line, straight through Macon and Atlanta.
- I-85 comes up from Alabama through Atlanta toward South Carolina.
- I-20 crosses east-west through Atlanta between Alabama and Augusta.
- I-16 drops southeast from Macon to Savannah — the coastal evacuation route.
- I-95 hugs the coast past Savannah and Brunswick.
Where mile markers matter most
South of Macon, I-75 is long, straight, and short on landmarks — the milepost is how you know where you are between exits. Around Atlanta, where I-75, I-85, and I-20 all cross, incident reports come fast and are pinned to mile markers. And on I-16, the milepost becomes critical when a hurricane is on the way.
Hurricane season and the I-16 reversal
When a major hurricane threatens Savannah and the Georgia coast, I-16 becomes the escape route — and in a full evacuation, the state can reverse the eastbound lanes so all traffic flows inland toward Macon. Contraflow start points, crossovers, and closures are announced by mile marker. If you're driving that plan for the first time with a storm behind you, knowing exactly which milepost you're passing keeps you oriented when the road itself is running backwards.
Live GDOT alerts, in one place
MileCheck pulls live road alerts straight from GDOT: closures, crashes, and construction, tied to the mile marker and direction so you can see what's ahead of you on your route — an Atlanta pileup, a work zone south of Macon, or a coastal closure during a storm.
Everyday and emergency
Whether you're running the Florida corridor, threading Atlanta at rush hour, or reporting a breakdown on a long straight stretch of I-75, the mile marker is the location Georgia's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, even where the cell signal drops — and it works on CarPlay and Android Auto too.
Keep reading
Nearby state guides: Alabama · Florida · North Carolina · South Carolina · Tennessee
Georgia 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