Interstate 495 in Massachusetts

Interstate 495
Blue Star Memorial Highway
Route information
Auxiliary route of I‑95
Maintained by MassDOT
Length:	120.74 mi (194.31 km)
Existed:	1957 – present
Major junctions
South end:	I‑195 / Route 25 in Wareham
	US 44 in Middleborough Route 24 in Bridgewater I‑95 in Foxborough US 1 in Plainville I‑90 at the Hopkinton-Westboro town line US 20 in Marlborough I‑290 in Marlborough Route 2 in Littleton US 3 in Chelmsford I‑93 in Andover
North end:	I‑95 in Salisbury
Location
Counties:	Plymouth, Bristol, Norfolk, Worcester, Middlesex, Essex
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Massachusetts State Highway System Interstate US State ← I‑395 I‑695 →

Interstate 495 (I-495) is an auxiliary route of I-95 in Massachusetts, maintained by the Massachusetts Department of Transportation (MassDOT). Spanning 120.74 miles (194.31 km), it is the second-longest auxiliary route in the Interstate Highway System, ranking behind I-476 in Pennsylvania by a difference of roughly 11 miles (18 km).

Essentially serving as an outer beltway that acts as a border which separates the Greater Boston cities and towns with other cities and towns in Massachusetts, I-495 has its northern terminus in Salisbury, where it splits from I-95. Its route forms an approximately 30-mile (48 km) arc around the city, and intersects seven additional radial expressways: I-93, U.S. Route 3 (US 3) , Route 2, I-290, I-90 (the Massachusetts Turnpike), Route 24, and I-95 once more. I-495 has its southern terminus in Wareham, at the meeting of I-195 and Route 25. Originally, the stretch from Route 24 to I-195 was signed as Route 25; that status now only begins east of I-195.

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Wikipedia