From the truck-heavy Shenandoah Valley to the I-95 corridor, Virginia's highways run on mile markers — and Virginia is one of the states whose DOT explicitly tells drivers to use them. Here's how they work, and how to see yours plus live VDOT alerts in real time.

How Virginia numbers its highways

Virginia mileposts count up from the southern or western end of each route. On I-81, mile 0 sits at the Tennessee line near Bristol and the numbers climb the length of the Shenandoah Valley to the West Virginia line around mile 323. VDOT's own guidance for reporting road problems literally tells drivers to note the route and the nearest mile marker when calling #77 or 911 — the mile marker is the official language of Virginia's roads. MileCheck bundles every Virginia highway's markers and works offline.

The corridors people actually drive

  • I-81 runs about 325 miles down the Shenandoah Valley, past Winchester, Harrisonburg, and Roanoke — with more truck traffic than almost any rural interstate in the country.
  • I-95 carries the East Coast corridor from the DC area south through Richmond.
  • I-64 crosses the state east–west, meeting I-95 at Richmond on its way from the mountains to Hampton Roads.
  • I-66 and US-29 serve Northern Virginia and the Piedmont.

Where mile markers matter most: I-81

Ask any Virginia trucker: I-81 is the road that demands a mile marker. Long rural stretches between exits, heavy truck volumes, mountain grades near the Tennessee end, and fog and ice in the valley mean incidents are frequent and locations are otherwise hard to describe. When a crash closes a stretch of the valley, the detour advice comes by milepost — and when you break down between exits, the mile marker is what gets help to you.

MP 0 · Tennessee line MP 150 MP 323 · WV line Bristol Harrisonburg Roanoke · MP 143
I-81 runs about 325 miles down the Shenandoah Valley, from the Tennessee line past Roanoke and Harrisonburg to the West Virginia line.

Fog, ice, and mountain weather

Virginia's weather trouble concentrates in the west: valley fog on I-81 that can drop visibility in minutes, winter ice on I-77's mountain grades near the North Carolina line, and snow in the highlands that arrives while Richmond stays dry. Hampton Roads adds its own coastal flooding and tunnel and bridge restrictions during storms. All of it gets announced by route and milepost.

Live VDOT alerts, in one place

MileCheck pulls live Virginia road alerts — closures, incidents, and work zones — tied to the mile marker and direction, so you can see what's ahead of you in the valley before you're parked behind it. Alerts are live statewide, and mile markers for every Virginia highway work even where the mountain signal drops out.

Everyday and emergency

VDOT tells drivers to report problems by route and mile marker — MileCheck makes that a glance instead of a guess. Whether you're running I-81 with the trucks, stuck on I-95 outside Richmond, or calling in a breakdown from a foggy valley shoulder, the app shows your exact marker in real time, down to a tenth of a mile, with CarPlay and Android Auto in the car.

Keep reading

Nearby state guides: Kentucky  ·  Maryland  ·  North Carolina  ·  Tennessee  ·  West Virginia

Virginia 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