US9

U.S. Route 9 (US9) is a major north–south United States Highway that runs from the Atlantic Coast of New Jersey eastward into the United States. The highway commences at the Delaware Water Gap near Hancock, New Jersey, and travels northward for approximately 365 miles, terminating at the Canada–United States border in Rouses Point, New York. Along its route, US9 serves as a primary corridor for travel between the Washington, D.C. metropolitan area and the Upper New York State region, linking numerous suburban and rural communities.

The highway passes through key cities such as Newark, New York City, New Rochelle, Port Chester, Yonkers, and Newark Valley, providing critical access to major interstate systems including I‑95, I‑95 Loop, I‑78, and I‑87. Historically, US9 was first designated in 1926 as part of the original U.S. Highway System. The route has undergone several realignments, particularly in the 1950s and 1960s, to accommodate expanding interstate travel and increased traffic volumes. Notable engineering feats on the highway include the various bridge structures over the Hudson, Raritan, and Delaware Rivers.

Despite substantial upgrades over the decades, sections of US9 remain heavily congested, especially on the New Jersey segments adjacent to the New York City metropolitan area. Ongoing infrastructure projects aim to alleviate traffic bottlenecks and improve safety along the corridor. US9 continues to function as an essential transportation artery for both commuters and freight traffic, supporting the economic vitality of the Eastern United States.