Avenue. The extension into Manhattan was eliminated by 1952 when NY 25A was truncated to the intersection of Northern and Queens Boulevards. In the 1960s, NY 25A was extended southwestward along Jackson Avenue to meet the Long Island Expressway (I-495) just east of where it enters the Queens–Midtown Tunnel. The east end of NY 25A was reconfigured to follow Sound Avenue across the north shore of Long Island from Wading River to Mattituck, where it rejoined NY 25. The former routing of NY 25A between Sound Avenue and NY 25 west of Riverhead went unnumbered until the early 1940s when it was re-designated as NY 254. NY 25A was moved back onto its original routing through the town of Riverhead in the early 1950s, supplanting NY 254 in the process. Former sections NY 25A has been realigned in several locations in order to bypass local streets or entire communities along its routing. Segments like the Roslyn Viaduct, for example, allow traffic to flow more freely over Hempstead Harbor and keeping the historic community to the south preserved intact. The old route through this area is now Old Northern Boulevard, East Broadway, and a section of Main Street in Roslyn between two parts of Old Northern Boulevard. This piece of Main Street is also part of its own historic district. Several smaller sections also exist: Huntington: Old Northport Road between Woodruff Court and Huntington Crescent Club. Centerport: between Little Neck Road (former CR 86) and Centershore Road. Northport: between Troy Court and the driveway to Stonyhill Equestrian Center. Fort Salonga: Old Route 25A from east of Sunken Meadow Road to east of Tanyard Place. Smithtown: Realigned segment between John Street and Monroe Street, and again at the vicinity of Stone Gate Court. Setauket: North Country Road from Bennet's Road to Ridgeway Avenue and Main Street; Ridgeway Avenue from there to current NY 25A. Rocky Point: North Country Road from west of Rocky Point Landing Road to Woodville Road. The current alignment carries the designation NY 25A Bypass, with the former alignment designated as NY 25A Business. Proposed bypasses Several bypasses were planned for NY 25A by the New York State Department of Transportation. Only the Roslyn Viaduct and the Rocky Point Bypass were constructed; other attempts to realign the highway were cancelled as a result of public opposition. The projects were largely opposed out of fear that they would lower property