Massachusetts Route 4
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| Route information | ||||
| Length: | 18.2619 mi (29.3897 km) | |||
| Existed: | 1930-1933 – present | |||
| Major junctions | ||||
| South end: |
  Route 2 / Route 225 in Lexington
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  I‑95 / Route 128 in Lexington  I‑495 / US 3 in Chelmsford
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| North end: |
 Route 3A in North Chelmsford
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| Location | ||||
| Counties: | Middlesex | |||
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Route 4 is an 18.3-mile (29.5 km) long state highway in northeastern Massachusetts. It runs south to north, serving many of Boston's western and northwestern suburbs, from an interchange with Route 2 in Lexington northwest to an intersection with Route 3A in North Chelmsford. Much of it, north of Lexington, runs parallel to U.S. Route 3 (the Northwest Expressway). The entire route is contained within Middlesex County.
Route 4 begins at Route 2's Exit 56 interchange in Lexington, just west of the border with Arlington. This interchange also serves as Route 225's eastern terminus, and the two routes begin overlapped with one another. Routes 4 and 225 proceed northward on Watertown Street, turning onto Massachusetts Avenue and meeting Route 2A in East Lexington, briefly sharing pavement with it. The two routes continue through the center of Lexington, where Mass Ave splits to the west, and Routes 4 and 225 continue northwest on Bedford Street. The concurrency passes near North Lexington and interchanges with Interstate 95 (Route 128) at Exit 31, before continuing northwest into the town of Bedford. Routes 4 and 225 pass into the center of town, meeting Route 62 and running concurrent through the town center. After passing through town, Route 62 splits to the west, while Routes 4 and 225 turn northward, splitting themselves soon thereafter; Route 225 to the northwest and Route 4 to the north.
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