Interstate 395 (Connecticut–Massachusetts)

I-395 begins in East Lyme as the Connecticut Turnpike leaves I-95 as the latter route turns more easterly toward New London. It is a relatively rural interstate for most of its length. It passes through Waterford into Montville where it meets Route 2A at exit 9. Eastbound Route 2A provides access to the Mohegan Sun Casino, while westbound Route 2A runs concurrently with I-395 into Norwich, and ends at exit 13, where it terminates as it joins its parent route, Route 2. After passing Route 2, I-395 bends to the east, and continues into Lisbon, Griswold, and Plainfield, where it bends more northerly and parallels Route 12 for most of the rest of its length. At the Plainfleld–Killingly town line, the Connecticut Turnpike splits to the east as unsigned SR 695 providing access to US 6 at the Rhode Island state line. I-395 continues north, and meets US 6 in Killingly. After crossing into Putnam, it has an interchange with US 44. It then passes through Thompson before crossing the Massachusetts state line into Webster.[3] After passing through Webster and Oxford, it enters Auburn where it has an interchange with US 20, which provides access to the Route 146 expressway. The I-395 designation for the highway ends as it meets I-90 (the Mass Pike) at exit 10 and becomes I-290 as it heads toward Worcester.

In Connecticut, there are three service plazas (a legacy of the Turnpike) that provide 24-hour gas stations, convenience stores, plus a Subway and Dunkin' Donuts.

• Montville — MP 8 - southbound only between exits 9 and 6.
• Plainfield — MP 35 - northbound and southbound between exits 32 and 35.

The Connecticut State Police Troop E barracks occupies the former service plaza on the northbound side at Montville.

I-95 at the I-395 split in East Lyme/Waterford town line.

The highway that is now I-395 from its southern terminus with I-95 in East Lyme to exit 35 in Plainfield opened on January 2, 1958, as part of the 129-mile (208 km) Connecticut Turnpike from Greenwich at the New York state line to Killingly at the Rhode Island state line. In 1964, work began on a freeway extension beyond the turnpike in Plainfield north towards Worcester, connecting to the Massachusetts Turnpike (I-90). This new freeway, as well as the existing section of the Connecticut Turnpike from East Lyme to Plainfield would be designated as Route 52. The section between Plainfield and US 44 near Putnam opened in 1967, and the section from US 44 to the Massachusetts state line opened in 1969. Massachusetts completed its section of the freeway in 1977.[4]

In 1983, in response to the cancellation of the proposed I-84 extension from Hartford to Providence, the Connecticut Department of Transportation (ConnDOT) wished to supplement the state's loss of Interstate mileage by applying an Interstate designation to Route 52. Initially, I-290 was to be extended from its southern terminus in Auburn, Massachusetts. However, in 1983, it was decided to instead apply the I-395 designation to the freeway south of I-90.[5]

In May 2013, ConnDOT announced that a project that would begin in early 2014 that included renumbering exits along its section of I-395, and Route 2A from the then-current sequential numbering system to a distance-based scheme to conform with federal exit numbering standards. During the transition, old exit numbers were posted atop the new exit numbers through 2017 to lessen any confusion.[6] The renumbering began on June 24, 2015, and ended in January 2016; the project included renumbering one sign in Massachusetts announcing the first southbound Connecticut exit.

Exit numbers were changed from sequential to distance-based numbering in Connecticut between July and December 2015. Along with Connecticut Route 2A, these are Connecticut's initial distance-based exit numbers.[7] MassDOT also planned to switch exit numbers on all of its interstates, including I-395, to distance-based numbering in 2016. But the contract to change exit numbers which was to be awarded in December 2015 was indefinitely postponed in the middle of 2016. It wasn't until November 18, 2019 that MassDOT confirmed that beginning in late summer 2020 the exit renumbering project will begin[8][9]

State	County	Location[10]	mi[10]	km	Old exit	New exit[11]	Destinations[12]	Notes
Connecticut	New London	East Lyme	0.00	0.00	—	—	I-95 south – New Haven, New York City	Exit 76 on (I-95) northbound
		Waterford	2.13	3.43	77	2	Route 85 – Waterford, Colchester
		Montville	5.34	8.59	78	5	Route 32 south (via SR 693) – New London	Southbound left exit and northbound entrance
			6.33	10.19	79	6	Route 163 – Uncasville, Montville
			9.60	15.45	79A	9	Route 2A east – Ledyard, Preston	Southern terminus of Route 2A concurrency
		Norwich	11.08	17.83	80	11	Route 82 – Salem, Downtown Norwich
			13.71	22.06	81E–W	13	Route 2 / Route 32 – Norwich, Hartford	Signed as exits 13A (east/south) and 13B (west/north); northern terminus of concurrency with Route 2A
			14.23	22.90	82	14	West Town Street (SR 642) – Yantic, Norwichtown (NB) To Route 2 west / Route 32 north – Hartford, Colchester (SB)
			18.17	29.24	83	18	Route 97 – Taftville, Occum
		Lisbon	19.53	31.43	83A	19	Route 169 – Lisbon, Canterbury	Northbound exit and southbound entrance
			21.16	34.05	84S–N	21	Route 12 – Jewett City, Griswold, Lisbon, Taftville	Signed as exits 21A (north) and 21B (south) southbound
		Griswold	22.28	35.86	85	22	Route 164 / Route 138 – Jewett City, Preston City, Pachaug
			24.26	39.04	86	24	Route 201 – Hopeville, Jewett City
	Windham	Plainfield	28.23	45.43	87	28	Lathrop Road (SR 647)
			29.65	47.72	88	29	Route 14A – Plainfield, Oneco
			32.30	51.98	89	32	Route 14 – Central Village, Moosup
			35.50	57.13	90	35	To US 6 east – Providence, RI	Northbound exit and southbound left entrance; access via Connecticut Turnpike
		Killingly	37.62	60.54	91E–W	37	US 6 – Danielson, Hartford, Willimantic, Providence, RI	Signed as exit 37A (east) and 37B (west) southbound
			38.40	61.80	92	38	Lhomme Street / Westcott Road (SR 607) – South Killingly, Danielson
			41.16	66.24	93	41	Route 101 – Dayville, East Killingly
			42.99	69.19	94	43	Lake Road – Attawaugan, Ballouville
		Putnam	45.24	72.81	95	45	Kennedy Drive
			46.09	74.17	96	46	To Route 12 / Heritage Road – Putnam, Putnam Heights
			47.05	75.72	97	47	US 44 – Woodstock, East Putnam
		Thompson	49.52	79.69	98	49	Route 12 – Grosvenor Dale	Northbound left exit and southbound entrance
			50.25	80.87	99	50	Route 200 – Thompson, North Grosvenor Dale
			53.57	86.21	100	53	Wilsonville Road – East Thompson, Wilsonville
					Connecticut–Massachusetts state line
Massachusetts	Worcester	Webster	1.006	1.619		1	Route 193 – Webster, Thompson, CT
			2.578	4.149	2	3	Route 16 – Webster, Douglas
			4.025	6.478	3	4	Cudworth Road – North Webster, South Oxford	Exit partially in Oxford
		Oxford	6.583	10.594	4	7	Sutton Avenue – Oxford, Sutton	Split into exits 4A (east) and 4B (west)
			8.989	14.466	5	9	Depot Road – North Oxford
		Auburn	11.495	18.499	6A	11A	US 20 east to Route 146 – Shrewsbury[13]
			11.500	18.507	6B	11B	US 20 west to I‑84 – Sturbridge
			11.94	19.22	—	—	I‑290 east to I‑90 / Mass Pike – Worcester	Continuation as I-290
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

Wikimedia Commons has media related to Interstate 395 (Connecticut–Massachusetts).

• Kurumi - I-395 Connecticut; Massachusetts