Massachusetts Route 1A
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| Route information | ||||
| Maintained by MassDOT | ||||
| Length: | 95.12 mi (153.08 km) | |||
| Existed: | by 1927 – present | |||
| Major junctions | ||||
| South end: |
 US 1A in Pawtucket, RI
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 I‑95 in Attleboro I‑495 in Wrentham US 1 in Dedham  I‑93 / US 1 / Route 3 in Boston I‑90 / Mass Pike in Boston Route 128 in BeverlyUS 1 from Newburyport to Salisbury
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| North end: |
 NH 1A in Seabrook, NH
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Route 1A is a south–north state highway in Massachusetts. It is an alternate route to U.S. 1 with three signed sections and two unsigned sections where the highway is concurrent with its parent. Due to the reconfiguration of tunnel interchanges brought on by the completion of the Big Dig, Route 1A is discontinuous in the downtown Boston area. Vehicles entering Downtown Boston via the Sumner Tunnel must take I-93 north to the exit for Government Center and make a U-turn to access the entrance ramp to I-93 south (which silently carries Route 1A south as well) and vice versa.
A short segment of Route 1A, 1.8 miles (2.9 km) in length, in Attleboro runs from U.S. Route 1A at the Rhode Island border through a junction with Interstate 95, before heading north and merging with Route 1. The entire length of this segment is known as Newport Avenue.
This segment of Route 1A extends roughly north from North Attleborough to Dedham, passing through the towns of Plainville, Wrentham, Norfolk, Walpole, Norwood and Westwood on the way. Prior to its realignment along I-95 and I-93, Route 1 continued north along the Providence Highway towards Boston at the junction of Route 1A and that road.
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