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 | ||
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