MileCheckTennessee is a long state, and I-40 goes the long way across it — roughly 455 miles from the Mississippi River in Memphis to the North Carolina line, through Nashville and Knoxville. Across all of it, TDOT talks in mile markers. Here's how Tennessee's mileposts work, where they matter most, and how to see yours plus live TDOT alerts in real time.
How Tennessee numbers its highways
Tennessee's mileposts count up from where a route enters the state and rise as you head north or east. On I-40, mile 0 sits at the Mississippi River in Memphis and the numbers climb all the way to roughly 455 at the North Carolina line. US highways and Tennessee state routes carry their own milepost lines. Mile marker data for every Tennessee highway is bundled into MileCheck and works offline.
The corridors people actually drive
- I-40 crosses the whole state, Memphis through Nashville and Knoxville to the North Carolina line — about 455 miles.
- I-24 cuts diagonally through Nashville and Chattanooga.
- I-65 runs south to north through Nashville; I-75 links Chattanooga and Knoxville on its way to Kentucky.
- I-81 peels off toward Virginia in the Tri-Cities corner of East Tennessee.
Where mile markers matter most: rolling roadblocks and the gorge
TDOT gives incident and rolling-roadblock locations by mile marker — when a crash or a work-zone operation slows I-40, the radio and the message boards say where by milepost, and knowing yours tells you whether it's ahead of you or already behind. The most demanding stretch is the far east end: I-40's run through the gorge at the North Carolina line, where the Smokies throw up fog banks that can swallow the road in seconds. Out there, between the rock face and the river, the mile marker is the location.
Smokies fog and mountain weather
The fog banks where I-40 threads the gorge at the North Carolina line are notorious — visibility can collapse with almost no warning, and pileups there have closed the interstate for hours. Winter ice on the Cumberland Plateau grades and spring thunderstorms across Middle Tennessee round out the state's driving weather. Every closure and every incident gets located the same way: route, direction, mile marker.
Live TDOT alerts, in one place
MileCheck pulls live TDOT SmartWay alerts — closures, incidents, and work zones — tied to the mile marker and direction, so you can see what's ahead of you on your route across all 455 miles of I-40 and the rest of the state.
Everyday and emergency
Whether you're crossing the whole state on I-40, reporting a breakdown on the plateau, or telling a tow truck where to find you in the gorge, the mile marker is the location Tennessee's roads run on. MileCheck shows yours in real time, down to a tenth of a mile, works offline where the mountains eat the signal, and rides along on CarPlay and Android Auto.
Keep reading
Nearby state guides: Alabama · Arkansas · Georgia · Kentucky · Mississippi · Missouri · North Carolina · Virginia
Tennessee 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