Route 15 is a state highway in the U.S. state of Connecticut that runs from a connection with New York's Hutchinson River Parkway in Greenwich, Connecticut to its northern terminus intersecting with Interstate 84 in East Hartford, Connecticut. Route 15 consists of four distinct sections: the Merritt Parkway, the Wilbur Cross Parkway, 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.