Route 25A

Route 25A is a significant east–west state highway in the U.S. state of New York, serving as a major arterial route across Long Island. It connects the urban core of New York City with the suburban and rural communities of Nassau and Suffolk counties, terminating on the North Shore. The road passes through numerous historic villages and is a key commercial and commuter corridor, paralleling the northern coastline of the Long Island Sound.

Route description

Beginning at the Queens–Midtown Tunnel plaza in Manhattan, the route traverses the borough of Queens, initially designated as Queens Boulevard and Northern Boulevard. It crosses the geographic boundary into Nassau County near the Great Neck area, continuing through a series of affluent villages along the Long Island Sound including Roslyn, Cold Spring Harbor, and Northport. The roadway features a mix of commercial development and scenic, tree-lined sections, particularly as it approaches Stony Brook and Setauket in Suffolk County. Its final segment runs through the Pine Barrens before terminating at an intersection with NY 25 near Calverton and the Brookhaven National Laboratory.

History

The corridor now followed was originally a network of local paths and colonial roads, such as the North Country Road, vital for travel between early settlements like Flushing and Smithtown. With the advent of the automobile, it was incorporated into the state highway system in the 1920s, receiving the designation NY 25A as an alternate route to the southern Jericho Turnpike. Significant realignments occurred during the mid-20th century, including bypasses constructed around the downtown areas of Port Jefferson and Riverhead to improve traffic flow. The construction of the Long Island Expressway and Northern State Parkway provided parallel high-speed routes, but it remains a crucial local thoroughfare. Preservation efforts, led by organizations like the Society for the Preservation of Long Island Antiquities, have protected historic landmarks along its path, including the Sherwood-Jayne House and Thompson House.

Major intersections

From west to east, key junctions include the connection to the Queens–Midtown Tunnel and I-495 in Queens. In Nassau County, it intersects major north-south routes like NY 107 in Roslyn, NY 106 in Glen Cove, and the Seaford–Oyster Bay Expressway. Within Suffolk County, significant crossings occur with NY 110 in Huntington, NY 112 near Port Jefferson Station, and NY 347 in Stony Brook. The eastern terminus is a junction with NY 25 just west of the Peconic River in Calverton, near the entrance to Grumman's former facilities.

Auxiliary routes

Several auxiliary state highways connect to or serve the corridor. These include NY 25B, a short spur in Flushing, and NY 25C, which provides a connection in Albertson. Former designations like NY 25D and NY 25E have been largely absorbed or decommissioned. The route also indirectly interfaces with parkways such as the Northern State Parkway and the Sunken Meadow State Parkway, which provide alternative routes across central Long Island. Local county roads, including County Road 21 and County Road 25A, maintain continuity of the corridor where the state designation ends or deviates.

Category:State highways in New York (state)