U.S. Route 3 - Major Intersections

Major Intersections

County Location Mile km Exit Destinations Notes
Middlesex
 Cambridge 55.7 89.6 Route 3 (Memorial Drive)
Route 2A		 Southern terminus of US 3; northern terminus of Route 3
56.8 91.4 Route 2 east (Boston University Bridge) Southern end of Route 2 concurrency
59.7 96.1 Route 16 west Southern terminus of Route 16 concurrency
61.2 98.5 Route 2 west (Concord Turnpike) Northern end of Route 2 concurrency
61.5 99.0 Route 16 east
Route 2A east		 Northern end of Route 16 concurrency; southern end of Route 2A concurrency
Arlington 62.9 101.2 Route 60 Brief concurrency with Route 60
63.2 101.7 Route 2A west Northern end of Route 2A concurrency
Burlington 72.0 115.9 25 I-95 / Route 128
Route 3A		 Southbound exit and northbound entrance; southern end of I-95/Route 128 concurrency; exit signed as 25A (north) and 25B (south)
Bedford 72.9 117.3 26 Route 62 – Burlington, Bedford
Billerica 76.1 122.5 27 Concord Road – Billerica, Bedford
77.5 124.7 28 Treble Cove Road – North Billerica, Carlisle
North Billerica 79.7 128.3 29 Route 129 – Billerica, Chelmsford
Chelmsford 81.2 130.7 30 Lowell Connector
I-495 – Lawrence, Marlborough		 Signed northbound as exits 30A (Lowell Connector), 30B (I-495 north, via Lowell Connector) and 30C (I-495 south);Northbound; exits 30A and 30BB share collector ramp northbound
Signed southbound as exits 30A (I-495 north) and 30B (I-495 south) and shares a collector ramp with exit 31; no access to Lowell Connector southbound
81.5 131.2 31 Route 110 – Chelmsford Exits 30C and 31 share collector ramps northbound; exits 31, 30B and 30A share collector ramp southbound
North Chelmsford 83.7 134.7 32 Route 4 – North Chelmsford, Chelmsford
85.8 138.1 33 Route 40 – Westford, North Chelmsford
Tyngsborough 88.0 141.6 34 Westford Road – Tyngsborough, Westford
89.6 144.2 35 Route 113 – Dunstable, Tyngsborough
91.0 146.5 36 Middlesex Road – South Nashua, NH No southbound exit; entrance ramp to northbound US 3 crosses the state line and merges with the highway in New Hampshire

91.3

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