U.S. Route 3 in Massachusetts

U.S. Route 3 in Massachusetts is a major north–south highway connecting the Greater Boston metropolitan area to New Hampshire. The route serves as a primary commuter and commercial corridor, passing through numerous suburban communities north of Interstate 95. Its southern terminus is at a complex interchange with I-95, U.S. Route 1, and Route 128 in Burlington, and it runs north for over 62 miles (100 km) to the state line at Tyngsborough.

Route description

From its southern terminus in Burlington, U.S. Route 3 heads northwest as a controlled-access freeway, concurrent with Route 128 for a short distance before splitting off near the Burlington Mall. It continues north through Bedford and Billerica, passing near the Hanscom Field air force base. The highway then traverses Chelmsford and Lowell, where it provides a key connection to the Lowell Connector and Interstate 495. North of Lowell, the route passes through Dracut and Tyngsborough, offering access to the Nashua River area before crossing the state line into Nashua, New Hampshire.

History

The alignment of U.S. Route 3 in Massachusetts largely follows early 20th-century auto trails, including the Boston Post Road and the Daniel Webster Highway. It was officially designated as part of the United States Numbered Highway System in 1926. Significant modernization began in the 1950s and 1960s, with the southern section from Burlington to Tyngsborough being upgraded to a limited-access highway, often referred to as the "North-South Expressway." This project was designed to alleviate congestion on older routes like Route 3A and improve access between Boston and New England's growing northern suburbs. Further improvements were made in the 1990s, including the construction of high-occupancy vehicle lanes in the median between Route 62 in Billerica and the New Hampshire border.

Major intersections

The entire route is in Middlesex County. {| class="wikitable" |- ! Location ! mi ! km ! Destinations ! Notes |- | Burlington | 0.00 | 0.00 | – Boston, Providence, Cape Ann | Southern terminus; road continues as MA 128 |- | Bedford | — | — | – Lexington, Concord | Interchange |- | Billerica | — | — | – Billerica Center, Arlington | Interchange |- | rowspan="2" | Lowell | — | — | – Marlborough, Haverhill | Interchange |- | — | — | Lowell Connector to US 3 north / MA 110 – Downtown Lowell | Interchange |- | Tyngsborough | 62.30 | 100.26 | US 3 north – Nashua, Manchester | New Hampshire state line; northern terminus |}

Auxiliary routes

The primary auxiliary route of U.S. Route 3 in Massachusetts is Route 3A, a surface road that generally runs parallel to the main highway. Route 3A serves as the original alignment, passing through the downtown areas of historic communities like Cambridge, Charlestown, Lowell, and Tyngsborough. Other related routes include the Lowell Connector, which links U.S. Route 3 with I-495 and central Lowell, and several state-numbered spur routes that provide local access in communities such as Billerica and Dracut.

See also

* Interstate 93 in New Hampshire * U.S. Route 3 in New Hampshire * Massachusetts Department of Transportation * List of U.S. Highways in Massachusetts * New England road marking system

Category:U.S. Highways in Massachusetts Category:Transportation in Middlesex County, Massachusetts