Massachusetts Route 3
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| Route information | ||||
| Maintained by MassDOT | ||||
| Length: | 55.7059 mi (89.6500 km) | |||
| Existed: | 1926 – present | |||
| Major junctions | ||||
| South end: |
 US 6 in Bourne
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 US 44 in Plymouth  I‑93 / US 1 from Braintree to Boston I‑90 / Mass Pike in Boston
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| North end: |
  US 3 / Route 2A in Cambridge
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| Location | ||||
| Counties: | Barnstable, Plymouth, Norfolk, Suffolk, Middlesex | |||
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Route 3 is a southward continuation of U.S. Route 3, connecting Cambridge, Massachusetts with Cape Cod. All of it, except for the northernmost end in downtown Boston and Cambridge, is a Controlled-access highway.
The section from Boston to Braintree is also marked as Interstate 93 and U.S. Route 1 and is known in downtown Boston as the Central Artery, and south of downtown as the Southeast Expressway. In Braintree, I-93 and US 1 split to follow the Yankee Division Highway to Interstate 95, and Route 3 continues south on its own, as the Pilgrims Highway. This section extends to a junction with U.S. Route 6 in Sagamore, just before the Sagamore Bridge over the Cape Cod Canal where Route 3 originally ended at rotary. Replacement of this rotary with an elevated "flyover" interchange was completed in November 2006.
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Wikipedia