List of Interstate Highways in Connecticut

Dwight D. Eisenhower National System of Interstate and Defense Highways
Dwight D. Eisenhower National System of Interstate and Defense Highways
	Standard Interstate Highway signs in Connecticut
	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 Highways	U.S. Route X
System links
	Connecticut State Highway System; Interstate; US; State SSR; SR; ; Scenic;

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
I-84	97.90	157.55	I-84 at the New York state line	I-84 at the Massachusetts state line	01969-01-011969	current
I-86	31.27	50.32	I-84 in East Hartford	I-86 at the Massachusetts state line	01971-01-011971	01984-01-011984	Renumbered I-84
I-91	58.00	93.34	I-95 in New Haven	I-91 at the Massachusetts state line	01959-01-011959	current
I-95	111.57	179.55	I-95 at the New York state line	I-95 at the Rhode Island state line	01964-01-011964	current
I-284	—	—	I-84 in Waterbury	I-291 in South Windsor	01976-01-011976	01983-01-011983	Unbuilt due to environmental concerns
I-291	6.40	10.30	I-91 in Windsor	I-84 in Manchester	01994-01-011994	current
I-384	8.53	13.73	I-84 / US 6 in East Hartford	US 6 / US 44 in Bolton	01971-01-011971	current
I-395	54.69	88.02	I-95 in East Lyme	I-395 at the Massachusetts state line	01968-01-011968	current
I-484	—	—	I-84 in Hartford	I-91 in Hartford	01968-01-011968	01983-01-011983	Became the Conlin–Whitehead Highway and unsigned SR 598
I-491	—	—	I-91 in Wethersfield	I-84 in East Hartford	01958-01-011958	01973-01-011973	Became Route 3 and parts redesignated as I-86
I-684	1.41	2.27	I-684 at the New York state line		01968-01-011968	current
I-691	8.92	14.36	I-84 at Southington–Cheshire	I-91 at Meriden	01976-01-011976	current
Former