State tunnels are the responsibility of the Maryland Transportation Authority of the Department of Transportation.

The Baltimore Harbor Tunnel opened in 1957, providing the first direct link north and south under the Harbor for vehicles bypassing Baltimore City. In 1985, the Fort McHenry Tunnel also crossed the Harbor and became a vital part of I-95, the East Coast's most important interstate route. Tolls are collected for both tunnels, and electronic toll-collection (known as M-TAG) began for both in 1999.

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 Maryland Manual On-Line, 2000

July 18, 2000   
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