Route 34 is a primary state highway in the U.S. state of Connecticut. Route 34 is 21.88 miles (35.21 km) long, and extends from Newtown near I-84 to Route 10 in New Haven. The highways connects the New Haven and Danbury areas via the Lower Naugatuck River Valley. The portion of the route between New Haven and Derby was an early toll road known as the Derby Turnpike. It formerly ran through downtown New Haven on the Oak Street Connector until the early 2020s.
Route 15 is a state highway in the U.S. state of Connecticut that runs 83.53 miles (134.43 km) from a connection with New York's Hutchinson River Parkway in Greenwich, Connecticut, to its northern terminus intersecting with Interstate 84 (I-84) in East Hartford, Connecticut. Route 15 consists of four distinct sections: the Merritt Parkway, the Wilbur Cross Parkway, most of the Berlin Turnpike, and part of the Wilbur Cross Highway. The unified designation was applied to these separate highways in 1948 to provide a continuous through route from New York to Massachusetts. The parkway section of Route 15 is often referred to locally as "The Merritt".
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 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 63 is a secondary state highway in the U.S. state of Connecticut, from New Haven up to Canaan, running for 52.57 miles (84.60 km). It connects the Greater New Haven area to Northwestern Connecticut via the western suburbs of Waterbury.
Route 67 is a secondary state highway in the U.S. state of Connecticut, from the town of New Milford in the Greater Danbury area to the town of Woodbridge in the outskirts of New Haven. The route runs for 31.00 miles (49.89 km). It generally follows a northwest-southeast path, and is signed north-south.
Route 122 is a primary, minor arterial highway in Connecticut. It runs from Interstate 95 (I-95) in West Haven north to Route 63 in New Haven. Route 122 is 3.51 miles (5.65 km) long.
Route 83 is a 35.65-mile-long (57.37 km) north–south state highway in the Greater Hartford and Greater Springfield areas of the U.S. states of Connecticut and Massachusetts. It serves as the main north–south artery for the towns of Manchester, Vernon, Ellington, and Somers, and continues through East Longmeadow center into downtown Springfield. The route in Massachusetts is town-maintained, except for the ramps connecting to U.S. Route 5 parallel to Interstate 91.
Route 64 is a Connecticut state highway connecting the towns of Woodbury and Waterbury via Middlebury.
Route 152 is a state highway in Connecticut running entirely within the town of Orange. It serves to connect the town center with U.S. Route 1 and Route 34.
Route 121 is a state highway in southern Connecticut running from U.S. Route 1 in Milford to Route 34 near the Orange-Derby line.
Route 243 is a state highway in Connecticut running for 6.70 miles (10.78 km) from Route 115 at the Ansonia-Derby town line to Route 63 in New Haven. It serves the Westville neighborhood of New Haven and the southern portions of the towns of Woodbridge and Ansonia. The road continues across the Naugatuck River as State Road 853 leading to Route 8.
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 81 is a state highway in Connecticut from Clinton center through Killingworth center to the village of Higganum in the town of Haddam.
Route 203 is a state highway in eastern Connecticut, running entirely within the town of Windham.
Route 148 is a state highway in southern and southeastern Connecticut running from Route 79 in Killingworth to Route 82 in the village of Hadlyme. Route 148 crosses the Connecticut River using the Chester–Hadlyme Ferry.
Route 132 is a state highway in western Connecticut, running from Route 47 in Woodbury, through Bethlehem center, to Route 63 in Watertown.
Route 115 is a Connecticut state highway in the Lower Naugatuck River Valley area, running from Route 34 in Derby to Route 67 in Seymour. The road runs along the east bank of the lower Naugatuck River.
Route 177 is a state highway in central Connecticut, running from Plainville to Canton.
US 1 in Orange 
Route 63 in Woodbridge 
