CT line in Ashley Falls to VT line in Williamstown via Great Barrinton and Pittsfield.
Multiplexed with US 20 between Lenox and Pittsfield. Cosigned with MA 2 in Williamstown.
NY line in Pittsfield to Boston via Springfield, Auburn, Marlborough, Waltham and Watertown.
Cosigned with US 7 from Pittsfield to Lenox. Cosigned with MA 8 east of West Becket.
Cambridge to NH line at Tyngsboro via Arlington, Burlington and Lowell.
Limited access highway north of I-95. Reverse multiplex with I-95. Multiplexed with MA 3A south of I-95.
RI border in Attleboro to NH border in Salisbury via N. Attleboro, Norwood, Boston, Revere, Danvers and Newburyport.
Paired along I-95 as a reverse multiplex in Norwood and Canton.
CT line in Southwich to NH line in Winchendon via Holyoke and Shutesbury
Multiplex with MA 10 from CT line to Westfield. Also picks up MA 57 briefly in Southwick.
RI border in Seekonk to Provincetown via Fall River, New Bedford, Buzzard's Bay, Sagamore and Orleans.
Expressway/Super-2 from Sagamore to Orleans.
Brief multiplex with MA 114A in Seekonk.
retired
CT line in Agawam to Springfield
CT line in Longmeadow to VT line in N. Bernardston via Springfield, Holyoke, Northampton ande Greenfield.
Brief multiplex with I-91 in Springfield.
RI line in Seekonk to Plymouth via Taunton
Brief multiplex with MA 140 in Taunton. Cosigned with MA 3 in Plymouth.
Paired with I-93 from its southern terminus north to the Tobin Bridge. Follows original planned route for I-95 north of Boston to Revere.
