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 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 25 is a 28.59-mile (46.01 km), primary state highway connecting the city of Bridgeport and the town of Brookfield in the U.S. state of Connecticut. Route 25 is a six-lane freeway from Bridgeport to northern Trumbull and a two-lane surface road the rest of the way to Brookfield.
Route 69 is a primary north–south state highway in the U.S. state of Connecticut connecting the city of New Haven to the city of Bristol in the western part of Greater Hartford, passing through Greater Waterbury along the way. The route extends north of Bristol as a secondary route into the town of Burlington. Route 69 is 35.16 miles (56.58 km) in total length.
Route 4 is an east–west primary state highway connecting rural Litchfield County to the Greater Hartford area of the U.S. state of Connecticut. It runs 46.72 miles (75.19 km) from the town of Sharon to the town of West Hartford.
Route 122 is a primary, minor arterial highway in the United States. It begins at Interstate 95 in West Haven, Connecticut. It runs north of West Haven center and roughly follows the path of the West River. It then enters the Westville neighborhood of New Haven and ends at Route 63. Route 122 is 3.51 miles (5.65 km) long.
Route 169 is a 47.36-mile-long (76.22 km) state highway in the U.S. states of Connecticut and Massachusetts. It begins in the city of Norwich, Connecticut, and runs 38 miles (61 km) through Northeastern Connecticut, continuing across the state line into Southbridge, Massachusetts. The route ends in Charlton after another nine miles (14 km). A portion of the route in the town center of Pomfret is on the National Register of Historic Places as Pomfret Street Historic District, and 32.10 miles (51.66 km) of the road is designated as the Connecticut State Route 169 National Scenic Byway.
New York State Route 343 (NY 343) is a state highway located entirely within central Dutchess County, in the Hudson Valley region of the U.S. state of New York. It runs east–west from the intersection of NY 82 in the village of Millbrook to the town of Amenia, where it crosses the Connecticut state line and continues eastward as Route 343, a Connecticut state highway located entirely within the town of Sharon. Along the way, it has a 7.3-mile (11.7 km) concurrency with NY 22 from vicinity of the hamlet of Dover Plains to the hamlet of Amenia.
New York State Route 124 (NY 124) is a 4.96-mile (7.98 km) long north–south state highway in the northern part of Westchester County, New York, in the United States. NY 124 begins at NY 137 in the hamlet of Pound Ridge. It heads north and crosses into the town of Lewisboro, ending west of the hamlet of South Salem at NY 35. Just before the junction with NY 35, NY 124 splits into a west leg and an east leg, with both legs ending at NY 35. Both legs are signed as NY 124 but the main line officially runs on the west leg. The east leg is internally designated as NY 983D, an unsigned reference route. Both legs are approximately 0.35 miles (0.56 km) in length.
New York State Route 128 (NY 128) is a 5.53-mile (8.90 km) long north–south state highway in northern Westchester County, New York. The route begins at an intersection with NY 22 just west of I-684 in the hamlet of Armonk. Crossing through downtown Armonk, the route connects to NY 117 in the southern end of the village of Mount Kisco.
New York State Route 137 (NY 137) is a 5.51-mile (8.87 km) long state highway in Westchester County, New York, in the United States. The route is a continuation of Connecticut's Route 137, which links NY 137 to Stamford, Connecticut. NY 137 goes through the hamlet of Pound Ridge and ends at NY 121 north of the hamlet of Bedford, locally known as Bedford Village.
Route 137 is a main highway running north/south through the city of Stamford, Connecticut. It runs for about 9.3 miles (15.0 km) from Downtown Stamford up to North Stamford and then to New York state line in the town of Pound Ridge, New York.
Route 27 is a north–south state highway in southeastern Connecticut running for 3.21 miles (5.17 km) from U.S. Route 1 in Mystic to Route 184 in Old Mystic.
U.S. Route 5 (US 5), a north–south U.S. 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 towards Springfield, Massachusetts.
Route 123 is a secondary state highway in southwestern Connecticut from Norwalk to the New York state line near the town of Lewisboro.
Route 104 is a Connecticut state highway in the city of Stamford, starting at from the Bulls Head section of the city then through North Stamford, with the highway ending at New York state line.
Route 106 is a state highway in southwestern Connecticut, running from Stamford to Wilton.
Route 136 is a state highway in southwestern Connecticut, running from Darien to Easton. The route was initially established in 1932 to serve the beach communities between Darien and Southport. Its eastern end was relocated in 1963 to head northeast from Westport to Easton instead.
Route 189 is a 22.43-mile-long (36.10 km) state route in the U.S. states of Connecticut and Massachusetts. The route begins in the northwestern portion of the Connecticut state capital of Hartford and ends in the rural town of Granville. In Massachusetts, the route is not a state highway and is maintained by the town of Granville.
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.
US 1 in Darien 
Route 15 / Merritt Parkway in New Canaan 
