Wilbur Cross Highway

The highway was built in the 1940s, before the Interstate Highway era, as a continuation of the Wilbur Cross Parkway, which itself is a continuation of the Merritt Parkway – all of which were once signed Route 15. Originally, the parkways were to span continuously from Greenwich to Union, but with the opening of Interstate 91, the planned segment between Meriden and Hartford was never built, and Route 15 was instead routed along the Berlin Turnpike.[3][4]

In 1958, the highway north of the Charter Oak Bridge was cosigned as I-84, as part of the interstate highway's planned route through Connecticut. In 1968, this designation was moved to a proposed highway from Hartford to Providence, and the then-cosigned portion with Route 15 was renumbered to I-86. The Route 15 designation remained cosigned with I-86 section south of the Massachusetts border until October 1, 1980, when it was truncated to its current northern terminus at exit 57 of I-84. The I-84 designation was restored in 1984 when the planned highway to Providence was cancelled.

From 1948 to 1982, US 44 was signed along the highway from current exit 60 to current exit 69.

Exit numbers correspond to those of Route 15 and Interstate 84. Old exit numbers correspond to when the I-84 was signed as Route 15.

State	County	Location	mi[1]	km	Old exit	New exit	Destinations	Notes
Connecticut	Hartford	Wethersfield	0.00	0.00		–	US 5 south / Route 15 south (Berlin Turnpike)	Continues south as the Berlin Turnpike
			1.76	2.83		85	Route 99 south – Wethersfield, Rocky Hill
		Hartford	2.16– 2.33	3.48– 3.75		86	I-91 south – New Haven, New York City	Exits 28-29 on I-91
			2.61	4.20		87	Brainard Road / Airport Road / I-95 south – Brainard Airport	No northbound signage for I-91; exit 27 on I-91
			3.42	5.50		89	I-91 north to I-84 west – Hartford, Springfield	Northbound exit and southbound entrance; exit 28 on I-91
		Connecticut River	4.01	6.45	Charter Oak Bridge
		East Hartford	4.06	6.53		90	US 5 north (Main Street) to Route 2 / East River Drive – Norwich	Northern terminus of US 5 concurrency; no southbound signage for Route 2
			4.85	7.81		91	Silver Lane (SR 502)	Northbound exit and southbound entrance
			5.64	9.08		57	I-84 west (US 6 west) to I-91 north – Hartford	Northern terminus of Route 15; westbound exit and eastbound entrance
			5.95	9.58		–	Silver Lane	Westbound exit from Restricted Lane
						58	Roberts Street (Route 518) / Silver Lane (Route 502 / Burnside Avenue – East Hartford
					91		Forbes Street	Closed to make way for construction exit 59
			7.23– 7.70	11.64– 12.39		59	I-384 east – Providence	Includes eastbound exit and westbound entrance to Restricted Lanes
		Manchester	8.59	13.82	92	60	US 6 east / US 44 (Middle Turnpike West) / Burnside Avenue – Manchester, East Hartford	US 6 continues east; westbound exit shares a ramp with exit 62
			8.38– 8.97	13.49– 14.44		61	I-291 west – South Windsor, Windsor	Eastern terminus of I-291
			9.56	15.39	93	62	Buckland Street – South Windsor, Manchester
			12.40	19.96	94	63	Route 30 / Route 83 – Manchester, South Windsor
	Tolland	Vernon	13.31	21.42	95	64	Route 30 / Route 83 – Vernon, Rockville, Talcottville
			13.81	22.23		–	I-84 west (Restricted Lanes)	Eastern terminus of Restricted lanes
			14.01	22.55	96	65	Route 30 – Vernon Center	Eastbound exit shared a ramp with exit 64
			15.75	25.35	97	66	Tunnel Road (SR 541) – Vernon, Bolton
			17.91– 18.26	28.82– 29.39	98	67	Route 31 – Rockville, Coventry
		Tolland	21.66	34.86	99	68	Route 195 – Tolland, Mansfield, Storrs	Access to the University of Connecticut
			24.63	39.64	100	69	Route 74 to US 44 – Willington, Tolland, Rockville, Putnam
		Willington	26.13	42.05	101	70	Route 32 – Stafford Springs, Willington, Mansfield, Willimantic
			28.28– 28.86	45.51– 46.45	102	71	Route 320 south (Ruby Road) – Willington	Northern terminus of Route 320
	Windham–Tolland county line	Ashford–Union town line	32.66	52.56	104	72	Route 89 – Stafford Springs, Westford, Ashford
	Tolland	Union	34.08	54.85	105	73	Route 190 – Union, Stafford Springs
			37.99– 38.55	61.14– 62.04	106	74	Route 171 / Holland Road – Union, Holland, Mass
			38.70	62.28	Connecticut–Massachusetts state line
Massachusetts	Hampden	Holland	38.99	62.75		–	Mashapaug Road	Westbound entrance only; former Route 15
	Worcester	Sturbridge	41.95	67.51		1	Mashapaug Road – Southbridge, Sturbridge	Former Route 15
			43.78	70.46		2	To Route 131 – Sturbridge, Southbridge	Signed for Old Sturbridge Village
			45.25– 45.57	72.82– 73.34		3A	US 20 – Worcester, Palmer	Signed as exits 3A (east) and 3B (west)
			46.41	74.69		–	I‑90 / Mass Pike – Springfield, Albany NY, Worcester, Boston	Exit 9 on I-90 / Mass Pike (to be renumbered exit 78)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Closed/former       Electronic toll collection       HOV only       Incomplete access       Route transition