Old Route 15
The number was formerly used for an extension of Connecticut's Route 15, nowInterstate 84. It connected the CT-15 from the state line in Holland with U.S. Route 20 and Interstate 90 (Massachusetts Turnpike) in Sturbridge. Sturbridge's Route 15 changed alignments several times over the years, as the Wilbur Cross Highway was upgraded to freeway standards (CT-15 used to run concurrently with I-84 to the state line, but was truncated in 1980 to its current terminus in East Hartford). Local lanes of the former Route 15 in Massachusetts are still in use today as Haynes Street, a road parallel to I-84 that ends at Main Street (Route 131) near Town Hall.