Route 15 five years before. The former Route 15 between South Windsor and Tolland was reassigned as an extension of Route 30, and the former Route 15 between New Haven and Glastonbury became redesignated as Route 17. In 1948, a portion of the Wilbur Cross Parkway between Route 34 and Whitney Avenue had still been under construction. Route 15 was temporarily routed along Route 34, Sherman Avenue (former Routes 5 and 10), Henry Street/Munson Street/Hillside Place/Edwards Street (former Route 5), and Whitney Avenue (former Route 10A). By 1949, the Wilbur Cross Parkway was completed and the temporary Route 15 designation was removed from the surface streets. Further improvements in the Wilbur Cross Highway took place over the next several years and the road became a four-lane divided highway by 1954. In 1968, most of the Wilbur Cross Highway was designated as I-86 and further upgrades to the road were implemented. Route 15 and I-86 overlapped from the current 15/84 junction in East Hartford to the Massachusetts state line. In 1984, the overlap was removed, truncating Route 15 to its current northern end, while at the same time I-86 was redesignated as I-84. Exit list Exits are currently sequential, but are planned to be converted to mileage-based exit numbering in 2025. References External links CT 15 (Greater New York Roads) 015 Transportation in Fairfield County, Connecticut Transportation in New Haven County, Connecticut Transportation in Hartford County, Connecticut U.S. Route 5