MileCheckWho maintains the road you're driving on?
The interstate, the county road, the city street, and the road through a national park are all run by different agencies — and it's not always the one you'd guess. Here's who's responsible for what.
State DOTs run the highways
Each state's Department of Transportation (DOT) maintains the interstates, US highways, and state routes within its borders — paving, plowing, signing, and posting the mile markers. State DOTs are also who publish the live road-condition and closure data. The federal government (FHWA) funds the Interstate System and sets the standards, but it doesn't do the day-to-day maintenance — the states do. (This is exactly why MileCheck works: it pulls together the data 50 state DOTs publish for their highways.)
Counties and cities run the local roads
Below the state system, county governments maintain county and rural roads, and city public-works departments maintain local streets, signals, and signs in town. That's why a pothole on the interstate goes to the state DOT, but one on your street goes to the city. It's also why detailed live road data usually stops at the state-highway level — local streets aren't centrally reported.
The "other" roads: federal land, tribal, and toll
Some roads answer to none of the above. Roads inside national parks (National Park Service) and national forests (US Forest Service) are run by those federal agencies. Tribal roads on reservations are managed with the Bureau of Indian Affairs. And many toll roads and turnpikes are run by a separate toll authority or turnpike commission — not the state DOT — which is why they sometimes have their own signage, apps, and rules.
Buses and trains: transit and rail
Transit is separate again. Buses and light rail are run by local or regional transit agencies. Passenger rail splits up: Amtrak runs intercity trains, regional authorities run commuter rail, and the tracks themselves are mostly owned by private freight railroads, overseen federally by the FRA. That's why a highway agency can't tell you when a train will clear a crossing — it's a completely different owner.
Who enforces vs who maintains
A DOT builds and maintains roads; it doesn't write tickets. Enforcement is a separate job: state police or highway patrol work the highways, county sheriffs cover unincorporated areas, and city police handle local streets. The rules for the vehicles themselves are split too — your state DMV handles registration and licensing, while the federal NHTSA sets vehicle-safety standards.
Why it matters on the road
Knowing who runs a road tells you who to call and what data exists. State-maintained highways are monitored, signed with mile markers, and reported live — which is what MileCheck reads. Off the state system, that coverage thins out. Wherever you are, your mile marker on a highway (or your exact coordinates anywhere) is how you tell someone precisely where you are. How to report your location →
Know exactly where you are — live
MileCheck shows your nearest mile marker in real time as you drive, plus live DOT alerts and the nearest camera on your route. Free to start, works offline, runs on CarPlay and Android Auto.
Questions, answered
Who maintains interstate highways?
The state DOT maintains the interstates within its borders — paving, plowing, signing, and mile markers. The federal government (FHWA) funds and sets standards for the Interstate System but doesn't do the maintenance; the states do.
What's the difference between a state, county, and city road?
State DOTs run interstates, US highways, and state routes. County governments maintain county and rural roads. Cities maintain local streets, signals, and signs. Which agency you contact about a road depends on which of them owns it.
Who maintains roads in national parks?
The federal agency that manages the land — the National Park Service in national parks, the US Forest Service in national forests, and similar agencies elsewhere. These roads are not run by the state DOT.
Who is responsible for railroad crossings?
The railroad that owns the tracks — mostly private freight railroads — along with federal oversight from the FRA. Highway agencies don't control train traffic, which is why they can't tell you when a crossing will clear.
Does the DOT give out tickets?
No. A DOT builds and maintains roads; it doesn't enforce traffic laws. That's the job of the state police or highway patrol on highways, county sheriffs in unincorporated areas, and city police on local streets.