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Description: The Fort McHenry Tunnel, located in Baltimore, Maryland, is a critical component of the Interstate 95 (I-95) highway system, facilitating the flow of traffic beneath the Patapsco River. Opened in 1985, it spans approximately 1.5 miles and consists of four parallel tubes, each with two lanes, making it one of the largest underwater highway tunnels in the United States. Named after the nearby historic Fort McHenry, famous for its role in the War of 1812 and inspiring the U.S. national anthem, the tunnel significantly alleviates congestion in the Baltimore metropolitan area by providing a direct route for vehicles traveling along the East Coast. Managed by the Maryland Transportation Authority, the Fort McHenry Tunnel is a vital infrastructure asset, enhancing regional connectivity and supporting economic activity.