Massachusetts Route 3A
Route 3A | ||||
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Route 3A highlighted in red | ||||
| Route information | ||||
| Maintained by MassDOT | ||||
| Length | 97 mi (156 km) | |||
| Existed | 1926–present | |||
| Southern segment | ||||
| Length | 53.392 mi (85.926 km) | |||
| South end | Route 3 in Plymouth | |||
| Major intersections | ||||
| North end | I-93 / US 1 / Route 3 / Route 203 in Boston | |||
| Northern segment | ||||
| Length | 22.5043 mi (36.2172 km) | |||
| South end | I-95 / US 3 / Route 128 in Burlington | |||
| Major intersections |
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| North end | NH 3A at the New Hampshire state line in Tyngsborough | |||
| Location | ||||
| Country | United States | |||
| State | Massachusetts | |||
| Counties | Plymouth, Norfolk, Suffolk, Middlesex | |||
| Highway system | ||||
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Route 3A is a 97-mile-long (156 km) state highway in eastern Massachusetts, which parallels Route 3 and U.S. Route 3 (US 3) from Cedarville in southern Plymouth to Tyngsborough at the New Hampshire state line.
Route 3A has two major posted segments, separated by a lengthy concurrency with Route 3 and US 3. Its southern portion parallels Route 3 from Cedarville in southern Plymouth to Neponset in the Dorchester area of Boston. Towns and cities that Route 3A traverse along its path include Plymouth, Kingston, Duxbury, Marshfield, Scituate, Cohasset, Hingham, Weymouth and Quincy.
North of Neponset, Route 3A runs, unsigned, concurrently with Route 3 and US 3 to Burlington, before separating again (MassDOT counts the mileage along Route 3 and US 3 between the two sections as part of MA 3A mileage).
The northern portion of Route 3A parallels U.S. Route 3 in northwestern Middlesex County. It stretches from Interstate 95 (I-95) in Burlington to the New Hampshire state line, where it continues as New Hampshire Route 3A.