List of Interstate Highways in Connecticut

Dwight D. Eisenhower National System of Interstate and Defense Highways
	Standard Interstate Highway signs in Connecticut
	290px All Interstate Highways in Connecticut
System information
Length:	446.33 mi (718.30 km)
Notes:	Interstate Highways in Connecticut maintained by ConnDOT
Highway names
Interstates:	Interstate X
US Routes:	U.S. Route X
State:	State Route X
System links
	Routes in Connecticut; Interstate; U.S.; State SSR; SR; ;

Interstate Highways in the U.S. state of Connecticut run a total of 446.33 miles (718.30 km). Connecticut has three primary highways and five auxiliary highways. Most of the highways are maintained by the Connecticut Department of Transportation, with the exception of Interstate 684, which is maintained by the New York State DOT.^[1]

In 1957, Connecticut received approval for the routes of its three primary Interstate highways: I-84, I-91, and I-95. This plan was extended in 1959 to include I-291 and I-491. The first Interstate Highway signs were installed on a completed section of I-91 north of Hartford in 1961. The primary interstates were all completed by 1969 after the last section of I-84 opened between Farmington and Plainville. The rest of the highways were built or renumbered to their current designations by 1994 when a five-mile section of I-291 opened 35 years behind schedule. Connecticut was one of the last states in the US to raise its maximum speed limit to 65 mph (105 km/h), which it did in 1998.^[2]

Though parts of the Interstate Highway System in Connecticut were once tolled, no toll booths exist today. All tolls on I-95 were removed in 1985 after a runaway truck ran into a line of cars waiting at a booth, killing seven.^[2]^[3]

Interstate Highways

Number	Length (mi)^[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I0084 !I-84	97.90	157.55	I-84 at the New York state line	I-84 at the Massachusetts state line	1969	current
I0086 !I-86	31.27	50.32	I-84 in East Hartford	I-86 at the Massachusetts state line	1971	1984	Renumbered I-84
I0091 !I-91	58.00	93.34	I-95 in New Haven	I-91 at the Massachusetts state line	1959	current
I0095 !I-95	111.57	179.55	I-95 at the New York state line	I-95 at the Rhode Island state line	1964	current
I0284 !I-284	—	—	I-84 in Waterbury	I-291 in South Windsor	1976	1983	Unbuilt due to environmental concerns
I0291 !I-291	6.40	10.30	I-91 in Windsor	I-84 in Manchester	1994	current
I0384 !I-384	8.53	13.73	I-84 / US 6 in East Hartford	US 6 / US 44 in Bolton	1971	current
I0395 !I-395	54.69	88.02	I-95 in East Lyme	I-395 at the Massachusetts state line	1968	current
I0484 !I-484	—	—	I-84 in Hartford	I-91 in Hartford	1968	1983	Became the Conlin–Whitehead Highway and unsigned SR 598
I0491 !I-491	—	—	I-91 in Wethersfield	I-84 in East Hartford	1958	1973	Became Route 3 and parts redesignated as I-86
I0684 !I-684	1.41	2.27	I-684 at the New York state line		1968	current
I0691 !I-691	8.92	14.36	I-84 at Southington–Cheshire	I-91 at Meriden	1976	current
Former