Massachusetts made mile markers matter more than almost any other state — in 2020 it renumbered its highway exits so the exit number is the mile marker. Here's how the system works, from the Berkshires to Boston, and how to see your exact milepost plus live MassDOT alerts in real time.

How Massachusetts numbers its highways

Massachusetts mileposts count up from the west and south. On I-90 — the Massachusetts Turnpike, the MassPike — mile 0 sits at the New York line and the numbers climb roughly 135 miles east to Boston. The Pike is a toll road with its own milepost tradition, and it's the state's clearest example of the big change: in 2020, MassDOT converted exit numbers statewide from sequential to milepost-based. Exit 90 now sits near mile 90. Know your exit and you know your mile; know your mile and you know your next exit. Mile marker data for every Massachusetts highway is bundled into MileCheck and works offline.

The corridors people actually drive

  • I-90 (MassPike) is the east–west spine — the New York line, the Berkshires, Springfield, Worcester, Boston.
  • I-95 arcs around Boston as the beltway's outer ring and runs the coast toward Rhode Island and New Hampshire.
  • I-495 is the outer orbit through the commuter belt; I-93 punches north–south through downtown Boston.
  • US-6 carries the Cape traffic, and Route 2 runs the Mohawk Trail across the north of the state.

Where mile markers matter most

The Pike through the Berkshires is the loneliest stretch — long gaps between exits, real winter weather in the hills, and a breakdown at night is a milepost conversation with dispatch. Around Boston it's the opposite problem: so many overlapping routes and ramps that "on 95 near the split" means five different places. A route plus a mile marker is the one description that's unambiguous in both worlds — and since the exit renumbering, it's also how every Massachusetts exit sign already talks to you.

MP 0 · NY line MP 50 MP 100 MP 134 · Boston Springfield Worcester · MP 90
The MassPike runs about 135 miles from the New York line through Springfield and Worcester into Boston — and since 2020, its exit numbers match its mileposts.

Nor'easters and the winter Pike

Massachusetts winters bring nor'easters that can shut down travel statewide, and the Pike through the Berkshire hills catches snow and ice earlier and harder than the coast. Speed restrictions, closures, and crash reports during storms are given by route and milepost, so a live alert tied to a mile number tells you exactly whether the trouble is ahead of you or behind you.

Live MassDOT alerts, in one place

MileCheck pulls live road alerts for Massachusetts straight from MassDOT — closures, crashes, and construction — tied to the mile marker and route so you can see what's between you and your exit. Alerts refresh in real time, and the mile marker data underneath works offline.

Everyday and emergency

Whether you're reporting a breakdown in the Berkshires, decoding a "crash at Exit 78" report (that's mile 78 now), or telling a friend which service plaza you're stopped at, the mile marker is the language Massachusetts highways speak. MileCheck shows yours in real time, down to a tenth of a mile, with CarPlay and Android Auto for the commute.

Keep reading

Nearby state guides: Connecticut  ·  New Hampshire  ·  New York  ·  Rhode Island  ·  Vermont

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Essentials: What to tell 911 on the highway  ·  How to find your mile marker  ·  Browse the live mile marker map  ·  All 50 states