Interstate 395 (I-395) is an auxiliary Interstate Highway in the U.S. states of Connecticut and Massachusetts; it is maintained by the Connecticut Department of Transportation (CTDOT) and the Massachusetts Department of Transportation (MassDOT). Spanning nearly 67 miles (108 km) on a south–north axis, it is the only spur route of I-95 in Connecticut. The 36-mile (58 km) section between its splits from I-95 in East Lyme and SR 695 in Plainfield is a component highway of the Connecticut Turnpike. Within that state, the highway is named the American Ex-Prisoner of War Memorial Highway from Plainfield to Thompson.
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 8 is a 67.36-mile (108.41 km) state highway in Connecticut that runs north–south from Bridgeport, through Waterbury, all the way to the Massachusetts state line where it continues as Massachusetts Route 8. Most of the highway is a four-lane freeway but the northernmost 8.8 miles (14.2 km) is a two-lane surface road.
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 79 is a 14.34-mile (23.08 km) state highway in southern Connecticut from Madison to Durham.
Route 85 is a north–south state highway in the east-central portion of the U.S. state of Connecticut linking the city of New London to the town of Bolton.
Route 35 is a state highway in Connecticut, located entirely within the town of Ridgefield, Fairfield County. Route 35 starts at the New York state line, where the road continues as New York State Route 35, and ends at U.S. Route 7. The road is often used as an alternative to the congested Route 7. Originally part of New England Route 3 in the 1920s, Route 35 was designated in 1932.
U.S. Route 6 (US 6) within the state of Connecticut runs for 116.33 miles (187.21 km) from the New York state line near Danbury to the Rhode Island state line in Killingly. West of Hartford, the route either closely parallels or runs along Interstate 84 (I-84), which has largely supplanted US 6 as a through route in western Connecticut. East of Hartford, US 6 serves as a primary route for travel between Hartford and Providence.
Route 159 is a 21.14-mile-long (34.02 km) state highway connecting the Hartford and Springfield areas in the U.S. states of Connecticut and Massachusetts. It begins as the northern extension of Main Street in Hartford and proceeds northward along the west bank of the Connecticut River towards Agawam, Massachusetts. The route ends at the junction of Route 147 and Route 75 in Agawam center just south of the West Springfield city line. The route was originally designated as U.S. Route 5A in 1932 and was renumbered to its modern designation in October 1968.
Route 75 in the U.S. states of Connecticut and Massachusetts is a 17.5-mile-long (28.2 km) scenic route connecting the Hartford, Connecticut, and Springfield, Massachusetts, areas. The route begins at Route 159 in the town of Windsor, Connecticut, and ends at the junction of Route 159/Route 147 in the city of Agawam, Massachusetts.
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.
Route 41 is a 17.86-mile (28.74 km) scenic state highway in rural Northwestern Connecticut. It extends from the New York state line in Sharon to the Massachusetts state line in Salisbury and is the only state-numbered route in Connecticut that has both its ends at a state border.
Route 37 is a north–south state highway in Connecticut running for 18.66 miles (30.03 km) from I-84, Route 39 and Route 53 in Danbury, through New Fairfield, to U.S. Route 7 in New Milford. The northernmost section between the town centers of Sherman and New Milford was once part of an early toll road known as the New Milford and Sherman Turnpike chartered in 1818.
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 190 is a state route in the northern part of the U.S. state of Connecticut. It starts at Route 75 in the town of Suffield and proceeds eastward across the Connecticut River through the towns of Enfield, Somers, and Stafford. It ends at Route 171, in the town of Union. Route 190 was established in 1932 as a route between the state line at Southwick and the town of Enfield. The route was later extended eastward to Union but was truncated in the west to Suffield center.
Route 171 is a state highway in northeastern Connecticut, running from Union to Putnam.
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.
Interstate 84 (I-84) is an east–west Interstate Highway across the state of Connecticut through Danbury, Waterbury, Hartford, and Union.
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.
