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The Governor Harry W. Nice Memorial Bridge, also known as the Potomac River Bridge, is a , two-lane continuous truss bridge that spans the Potomac River between Newburg in Charles County, Maryland and Dahlgren in King George County, Virginia, USA.〔(【引用サイトリンク】title=MdTA toll facilities: southern region: Nice Bridge )〕 The bridge is narrow (one lane in each direction with no shoulders), steep (up to 3.75 percent grade), and has a reduced speed limit (50 mph on the main span, even slower through the toll gates and plaza).〔(【引用サイトリンク】title=Roadway Design and Features )〕 This combination causes cars and trucks to slow and merge, which often results in backups. This two lane bridge carries U.S. Route 301, which is a spur of U.S. Route 1 and a popular north-south alternative for bypassing the Baltimore-Washington Metropolitan Area as well as Interstate 95, Interstate 495 (Capital Beltway), and the Woodrow Wilson Bridge to the north along the Potomac River. The traffic growth/volume in Southern Maryland has led to congestion and delays, especially on holidays and weekends.〔(【引用サイトリンク】title=Bridge Maintenance )〕 In 2005, the bridge handled approximately 6.4 million vehicles.〔(【引用サイトリンク】title=Traffic Operations and Safety )〕 It is one of eight toll facilities operated by the Maryland Transportation Authority, and is the only toll bridge over the Potomac River. ==History== President Franklin D. Roosevelt presided over the ground-breaking ceremony for the bridge in 1939.〔 〕 Known as the Potomac River Bridge when opened in December 1940, the bridge was renamed in 1967 for Harry W. Nice (1877–1941) who served as governor of Maryland from 1935 to 1939.〔(【引用サイトリンク】title=Maryland Manual, 1977-78 )〕〔(【引用サイトリンク】title=Civil Engineering in Maryland )〕 The bridge was the first south of Washington, DC to provide a highway link between Maryland and Virginia.〔(【引用サイトリンク】title=Project Overview and Background )〕〔(【引用サイトリンク】title=The Governor Harry W. Nice Bridge )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Governor Harry W. Nice Memorial Bridge」の詳細全文を読む スポンサード リンク
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