MileCheckTexas does highways at Texas scale — including the longest single-state interstate run in the country. Here's how TxDOT's reference markers work, where they matter most on those enormous distances, and how to see your exact one plus live DriveTexas conditions in real time.
How Texas numbers its highways
TxDOT marks its routes with reference markers: on the interstates you'll see them roughly every mile, while on US and state highways they typically appear every two miles. The numbering runs west to east and south to north, so mile 0 on I-10 sits out at El Paso and the numbers climb all the way to the Louisiana line. Texas also has a road network no other state does — Farm-to-Market (FM) and Ranch-to-Market (RM) roads, thousands of miles of numbered rural routes that knit the state together.
The corridors people actually drive
- I-10 crosses about 880 miles from El Paso to Orange — the longest stretch of one interstate in any single state.
- I-35 runs the NAFTA corridor from Laredo through San Antonio, Austin, and Dallas–Fort Worth.
- I-20 splits off I-10 in West Texas and carries traffic through Midland–Odessa, Abilene, and Fort Worth toward Louisiana.
- I-45 links Houston and Dallas; US-90 and US-290 carry the in-between traffic.
Where mile markers matter most: the empty stretches
West of San Antonio, I-10 runs hundreds of miles with towns few and far between. Out there, the reference marker is often the only location you have — there's no cross street, no landmark, sometimes no cell service. A breakdown at mile 310 versus mile 410 is the difference of an hour for the tow truck, and on the two-mile-spaced US highways you may not be able to see a marker from where you're stopped. That's exactly the gap a live, offline mile marker readout fills.
Heat, ice, and hurricane season
Texas weather works both ends of the thermometer. Summer heat blows tires and boils radiators on the long western stretches; a fast-moving winter ice storm can shut hundreds of miles of I-35 or I-20 within hours, because most of the state doesn't run fleets of plows. And along the Gulf, hurricane season means contraflow evacuations and closures announced by route and mile. In every case the location language is the same: the reference marker.
Live DriveTexas alerts, in one place
MileCheck pulls live road conditions from TxDOT's DriveTexas system — closures, construction, crashes, and hazards — tied to the route and mile marker so you can see what's ahead of you before you're stuck behind it. On a state this big, knowing about a closure 200 miles out changes the whole day.
Everyday and emergency
Whether you're crossing West Texas on I-10, threading Austin traffic on I-35, or reporting a breakdown to roadside assistance somewhere between towns, the reference marker is the location Texas roads run on. MileCheck shows yours in real time, down to a tenth of a mile, even where the cell signal drops.
Keep reading
Nearby state guides: Arkansas · Louisiana · New Mexico · Oklahoma
Texas 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