US 3 shield from wikimedia US 3 / Northwest Expressway

21 Miles, From I-95/128 in Burlington to NH Border

Interchange

Milepost

Current Exit Number

Proposed Exit Number

 I-95 shield image from wikimedia(MA 128 shield image from wikimedia) South - Providence, RI (SB)

72.0

25A

70A*

 I-95 shield image from wikimedia(MA 128 shield image from wikimedia) North - Portsmouth, NH (SB)

72.0

25B

70B

 MA 62 shield image from wikimedia - Burlington, Bedford

72.9

26

73

 Concord Rd - Billerica, Bedford

76.1

27

76

 Treble Cove Rd - N. Billerica

77.5

28

78

 MA 129 shield image from wikimedia - Billerica, Chelmsford

79.7

29

80

 Lowell Connector

81.2

30A

81A

 I-495 shield image from wikimedia North - Lawrence

81.2

30B

81B

 I-495 shield image from wikimedia South - Marlborough

81.2

30C

81C

 MA 110 shield image from wikimedia -  Chelmsford

81.5

31

82

 MA 4 shield image from wikimedia - North Chelmsford, Chelmsford

83.7

32

84

 MA 40 shield image from wikimedia - Westford, North Chelmsford

85.8

33

86

 Westford Rd - Tyngsborough

88.0

34

88

 MA 113 shield image from wikimedia - Dunstable, Tyngsborough

89.6

35

90

 Middlesex Rd - S. Nashua, NH

91.0

36

91

This exit list contains both the current exit number and proposed exit number if/when MassDOT converts US 3 to the Geographic Reference or Milepost Exit Numbering system. MassDOT awarded a contract to replace the exit numbers in December 2015 and was supposed to be switching over routes in western and southern parts of the state in 2016, however the project now has been indefinitely postponed. The proposed numbers provided were based on contract documents provided by the MassDOT Highway Division for the postponed project, and may be subject to change.

*US 3's mileage is a continuation of the mileage of MA 3 from it's beginning at MA 2A in Cambridge.

*Recommended Changes: MassDOT will be reviewing the proposed exit numbers for possible changes prior to work to create the new exit tabs. Here's some changes I'd suggest:

I-95 Exits. The proposed numbers here are 70A and 70B, but the exit is listed at mile marker 72. The number should at least be 71, if not 72.

© Robert H. Malme 2014-2016