List of Interstate Highways in Massachusetts explained

Interstate Highways in Massachusetts

Shields:

State:	MA
Type:	I
Route:	90

State:	MA
Type:	I
Route:	495

Caption:

Highway marker for I-90 and I-495

Maint:

MassDOT

Length Mi:

565.63

Length Ref:

^[1]

Formed:

August 14, 1957^[2]

Interstate:

Interstate nn (I-nn)

Links:

Map Custom:

yes

Map Notes:

Interstate Highways highlighted in red

The Interstate Highways in Massachusetts comprise five current primary Interstate Highways and eight auxiliary Interstates. In addition, two auxiliary Interstates were proposed and then cancelled.

The longest Interstate Highway in Massachusetts is I-90 with 136 miles, followed by I-495 with 121 miles.

Several freeway projects in the Boston area planned as part of the Interstate Highway System were cancelled in the 1970s following community opposition, including the Inner Belt (I-695) and Southwest Expressway (I-95).^[3] The Big Dig megaproject in the 1990s and 2000s, which realigned several highways in Downtown Boston, included a new tunnel for I-93 to replace the Central Artery and an extension of I-90 via the Ted Williams Tunnel.^[4]

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Notes and References

Web site: Kevin . Adderly . January 15, 2014 . Table 3: Interstate Routes in Each of the 50 States, District of Columbia, and Puerto Rico . Route Log and Finder List . . May 20, 2014.
Public Roads Administration . Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials August 14, 1957 . Scale not given . Washington, DC . Public Roads Administration . August 14, 1957 . November 22, 2010 . .
News: McDonald . Danny . December 5, 2022 . Transformative decision a half-century ago to scrap I-95 extension still resonates in Boston today . . registration . live . https://archive.today/20221205143927/https://www.bostonglobe.com/2022/12/05/metro/transformative-decision-half-century-ago-scrap-i-95-extension-still-resonates-boston-today/ . December 5, 2022 . December 5, 2022.
Web site: The Big Dig: tunnels and bridges . . December 5, 2022.