Connecticut Route 15

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 (both freeways), 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 15 begins at the New York border, where the Hutchinson River Parkway continues southwest towards New York City, at the New York State Route 120A interchange in the village of Rye Brook, in the town of Rye, New York. The highway comes into the state of Connecticut, continuing as the Merritt Parkway, a four-lane controlled-access parkway with low bridges, sharp curves, and a tree-filled median, that passes through the affluent urbanized areas of southern Fairfield County. Commercial vehicles are prohibited on this section of Route 15. The parkway heads into the town of Greenwich, where it passes a service plaza in both directions and curves north-northwest, before heading northeast and meeting interchanges at Round Hill Road, providing access to Downtown Greenwich, and at Lake Avenue. From there, Route 15 turns northeast, and curves through its interchange with North Street, which provides another outlet into Downtown Greenwich. Past this interchange, the parkway enters the city of Stamford, where it crosses over the Mianus River within the Mianus River State Park, before reaching an interchange with Route 104 in the residential areas of North Stamford, providing access to Downtown Stamford and the University of Connecticut Stamford Campus. Route 15 continues to an interchange with Route 137 before the route leaves Stamford.

The parkway comes into the town of New Canaan, where it crosses the Noroton River within its interchange with Route 106, adjacent to the Talmadge Hill station on the New Canaan Branch of the Metro-North Railroad's New Haven Line, located to the southeast of the interchange. Afterwards, Route 15 passes under the New Canaan Branch and curves around to meet an interchange for Route 124 before reaching the New Canaan Service Plaza. After crossing the Fivemile River, the parkway enters the city of Norwalk and immediately comes to an interchange with Route 123, which provides access to the Norwalk Community College. Just past its crossing of the Silvermine River, Route 15 meets the U.S. Route 7 (US 7) freeway at an incomplete interchange before it crosses over the Danbury Branch of the New Haven Line just south of the Merritt 7 station, and the Norwalk River and comes to a cloverleaf interchange with Main Avenue which provides the missing movements between the parkway and US 7. From there, Route 15 continues northeast through residential areas in the neighborhood of Cranbury before it leaves Norwalk, after crossing over Route 53 without an interchange.

The parkway enters the town of Westport, where it crosses over the Saugatuck River, and comes to right-in/right-out interchanges with Route 33, just east of the town line. Route 15 turns to the northeast again, upon reaching its interchange with Route 57, that has a park and ride lot serving the town of Westport in its northwest corner. Immediately after this interchange, the parkway crosses over Route 136 with no access and enters its longest stretch without exits, where it passes more wooded residential areas and comes into the town of Fairfield, where it meets its next interchange, five and a half miles later, at Route 58, which also has a park and ride lot, located in its southeastern corner. Route 58 provides access to both Fairfield Center and the campus of Fairfield University. Route 15 crosses the Mill River, passes service plazas in both directions, and then meets Route 59 at a pair of right-in/right-out interchanges. Route 59 provides access to the headquarters of General Electric. The parkway turns east-northeast and enters the town of Trumbull at its interchange with Park Avenue, which provides access to the campus of Sacred Heart University just to the southwest of the road, as well as the campus of the University of Bridgeport in the adjacent city of Bridgeport. Route 15 then reaches a single-point urban interchange with Route 111, adjacent to the Westfield Trumbull shopping mall, in its southwestern corner. The parkway meets the Route 25 freeway at an incomplete turbine interchange, which provides access to the Beardsley Zoo in Bridgeport, and the route crosses the Pequonnock River within the interchange. Past Route 25, Route 15 reaches a southbound exit and northbound entrance for Route 127 and then a full interchange for Route 108, in tandem with stack interchange with the Route 8 freeway.

Route 15 comes into the town of Stratford through more wooded suburban areas, and reaches an interchange with Route 110 at the northeastern edge of town. Past this interchange, the parkway runs due east to cross the Igor Sikorsky Memorial Bridge over the Housatonic River where it leaves both Stratford and Fairfield County. Route 15 enters both Milford and New Haven County, coming to a modified trumpet interchange with the Milford Parkway which provides access to both the I-95 freeway and US 1, north of Downtown Milford. At this point, the Merritt Parkway ends and Route 15 turns northeast again through the wooded residential areas of southwestern New Haven County.

The next component of Route 15, the Wilbur Cross Parkway, begins at the Milford Parkway junction. The Wilbur Cross Parkway follows the same general configuration and landscape as the Merritt Parkway, continues with the Merritt Parkway's exit numbers, and excludes commercial vehicles from its use, too. A few miles after the Milford Parkway, Route 15 comes into the town of Orange, where it passes a bi-directional service plaza, and meets Route 121 at a pair of right-in/right-out ramps, which provides access to the Orange campus of the University of New Haven. Now running north-northeast, Route 15 continues to a cloverleaf interchange with Route 34 which provides access eastbound to the Yale Bowl, in the city of New Haven. The parkway crosses the Wepawaug River, where it turns northeast and enters the town of Woodbridge, passing under Route 114 without access. Route 15 again crosses a boundary and comes into New Haven, where it meets an interchange with Route 69/Route 63 that provides access to the campus of Southern Connecticut State University, in the neighborhood of Amity, crossing the West River within the interchange.

From here, the parkway briefly crosses back through the southeastern corner of Woodbridge, before coming back into New Haven, and entering Heroes Tunnel which passes under West Rock Ridge State Park. Immediately after exiting the tunnel, Route 15 comes into the town of Hamden, where it heads into a mix of residential and commercial areas around its interchange with Route 10. The parkway then enters the town of North Haven, where it crosses the Mill River and passes under the Route 40 freeway as the only freeway crosspath ^{[check spelling]} in the state without an interchange, over East Rock. A short distance later, the parkway meets an interchange with Route 22 and continues northeast to the last pair of service plazas on the route. Past the plazas, Route 15 turns north-northeast along the western edge of the Quinnipiac River State Park, where the route enters the town of Wallingford. In Wallingford, the parkway has exits to Quinnipiac Street providing access to Gaylord Specialty Healthcare and the Wallingford station on Amtrak and ConnDOT's Hartford Line, as well as Route 150 that provides access to the Masonicare Health Center. Route 15 crosses the Quinnipiac River and turns northeast, where it comes to an interchange for US 5, where it also crosses the Hartford Line.

Route 15 continues northeast into the city of Meriden and passes entrances to the ConnDOT maintenance facilities. The parkway continues a short distance before reaching an interchange complex on the east side of town. First, Route 15 crosses over the I-91 freeway, where it turns north to reach a southbound exit and northbound entrance, before meeting East Main Street, which provides access to the Wesleyan University campus, where the Interstate Highway begins to run inside the median. The parkway widens to six lanes through here, then reaches the next exits for northbound I-91 with a northbound exit and southbound entrance, as well as a northbound exit and southbound entrance to and from the westbound direction of the I-691 freeway, where there is also access from westbound I-691 to the northbound Wilbur Cross Parkway. Past I-691, Route 15 narrows back to four lanes, and turns north-northwest before heading north-northeast again, where the Wilbur Cross Parkway ends and northbound US 5 merges with northbound Route 15 to head toward the suburban areas of Greater Hartford.