Interstate 691 (I-691) is an auxiliary Interstate Highway in Connecticut beginning at I-91 in Meriden and ending at I-84 near the Cheshire–Southington town line. According to the Federal Highway Administration, it is 8.38 miles (13.49 km) in length; however, the Connecticut Department of Transportation (CTDOT) includes the 0.54 miles of the exit ramp that I-691 uses to the merge with westbound I-84, making their recorded length 8.92 miles (14.36 km) long.
Route 138 is a numbered State Highway running 48.3 miles (77.7 km) in Rhode Island. It is the longest state numbered route in Rhode Island, and the second longest highway after US 1. Route 138 begins in Exeter at the Connecticut state line in the west and runs to the Massachusetts state line in Tiverton in the east, and is the only state-numbered route to completely cross Rhode Island. Route 138 also keeps the same route number on the other side of both state lines.
Connecticut Route 80 is a 25.9 mile highway that runs through south-central Connecticut. The west end is at CT 17 in Quinnipiac Meadows neighborhood of New Haven, and the east end is at CT 154 in Deep River. Route 80 runs within 5 miles of many town squares- including Downtown New Haven.
Route 40, also known as the Mount Carmel Connector, is a 3.08-mile (4.96 km) spur route from Interstate 91 in North Haven, Connecticut connecting I-91 and Bailey Road in North Haven to Route 10 in the Mount Carmel neighborhood of Hamden. Route 40 is a four-lane freeway with one intermediate exit leading to/from U.S. Route 5 in North Haven. It crosses over Route 15 but does not have an interchange with it. This is the only place in the state where two freeways cross without an interchange.
Route 17 is a primary north–south state route beginning in New Haven, through Middletown, and ending in Glastonbury, with a length of 36.33 miles (58.47 km).
Route 9 is a 40.89-mile-long (65.81 km) expressway beginning in Old Saybrook and ending at I-84 near the Farmington–West Hartford town line. It connects the Eastern Coastline of the state along with the Lower Connecticut River Valley to Hartford and the Capital Region.
Route 66 is an east-west state highway running from Meriden to Windham, serving as an alternate east–west route to US 6 through east-central Connecticut.
Route 2 is a 58.03-mile (93.39 km) state highway in Hartford and New London counties in Connecticut. It is a primary state route, with a freeway section connecting Hartford to Norwich and following surface roads to Stonington. The entire freeway section of Route 2 is also known as the Veterans of Foreign Wars Memorial Highway Though it is labelled an east-west highway, it follows a northwest-southeast route, with large sections of the highway running north-south throughout its duration.
Route 22 is a 14.07-mile-long (22.64 km) secondary state route within the U.S. state of Connecticut. Route 22 is an L-shaped road that is signed east–west from Hamden to the western junction of Route 80 in North Branford, and north–south to its eastern terminus in Guilford. It was designated in 1951 as a bypass of New Haven, connecting the Wilbur Cross Parkway and Route 80.
Route 103 is a state highway in Connecticut running from the Quinnipiac Meadows neighborhood in New Haven, through the Montowese area of North Haven, ending at the town center of North Haven.
Route 77 is a state highway in southern Connecticut. It is a state-designated scenic road and runs from the Guilford town green, through North Guilford, into the town center of Durham.
Route 99 is a state highway in Connecticut running for 10.64 miles (17.12 km) from Route 9 in Cromwell, through the town of Rocky Hill, ending in Wethersfield at the Hartford city line. The road continues into Hartford as a local road. It follows the former alignment of Route 9 from prior to that route's upgrade to a freeway.
Route 154 is a state highway in Connecticut running for 28.24 miles (45.45 km). It serves as one of the main thoroughfares in the town of Old Saybrook, intersecting twice with U.S. Route 1. North of I-95, Route 154 runs parallel to Route 9, along to the west bank of the Connecticut River. The route ends in Middletown at Route 9.
Route 94 is an east–west state highway in Connecticut running for 9.33 miles (15.02 km) from Route 2 in Glastonbury to Route 85 in Hebron.
Route 73 is an east–west state highway in Connecticut connecting the town center of Watertown to the Route 8 expressway in Waterbury via the village of Oakville. The road is classified as an urban principal arterial road and carries traffic volumes of about 16,400 vehicles per day.
U.S. Route 5 (US 5), a north–south United States Numbered Highway that is generally paralleled by Interstate 91 (I-91), begins at the city of New Haven in Connecticut and heads north through western Massachusetts and eastern Vermont to the international border with Canada. Within Connecticut, US 5 proceeds north from New Haven and passes through Meriden and Hartford toward Springfield, Massachusetts.
Route 118 is a state highway in northwestern Connecticut, running from the borough of Litchfield via the village of East Litchfield to the town center of Harwinton. Route 118 is a scenic road at both ends. The 2.8-mile (4.5 km) section from the western terminus at the Litchfield green to the village of East Litchfield, and the 0.1-mile (0.16 km) section within the town center of Harwinton have both been designated by the state as scenic roads.
Route 147 is a state highway in central Connecticut running from Durham to Middlefield.
The Willow Brook Connector is a 1.45-mile (2.33 km) unsigned expressway in the town of Berlin, Connecticut. The road is designated but not signed as State Road 571. It gets its name from Willow Brook Park, which begins on the north side of the roadway as one heads into the city of New Britain, or to New Britain Stadium for a baseball game.
U.S. Route 44 (US 44) is an east–west United States Numbered Highway that runs for 237 miles (381 km) through four states in the Northeastern United States. The western terminus is at US 209 and New York State Route 55 (NY 55) in Kerhonkson, New York, a hamlet in the Hudson Valley region. The eastern terminus is at Route 3A in Plymouth, Massachusetts.
Route 17 in Middletown 
Route 9 in Middletown 
