The Massachusetts Turnpike (colloquially the "Mass Pike" or "the Pike") is a controlled-access toll road that runs concurrently with Interstate 90 (I-90) in the U.S. state of Massachusetts. It is the longest Interstate Highway in Massachusetts, spanning 138 miles (222 km) along an east–west axis.
The turnpike opened in 1957, and it was designated as part of the Interstate Highway System in 1959. It begins at the New York state line in West Stockbridge, linking with the Berkshire Connector portion of the New York State Thruway. The original western terminus of the turnpike was located at Route 102 in West Stockbridge before I-90 had been completed in New York state. The turnpike intersects with several Interstate Highways as it traverses the state, including I-91 in West Springfield; I-291 in Chicopee; I-84 in Sturbridge; the junction of I-290 and I-395 in Auburn; and I-495 in Hopkinton. The eastern terminus of the turnpike was originally at Route 128 (now cosigned with I-95) in Weston, and has been extended several times: to Allston in 1964, to the Central Artery (at the time designated as I-95/Route 3; currently designated as I-93/US 1/Route 3) in Downtown Boston in 1965, and to Route 1A in East Boston as a route to Logan International Airport in 2003 as part of the "Big Dig" megaproject. I-190 and I-290 are the two auxiliary Interstate Highways that serve the route.
