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Virginia State Route 110
Virginia State Route 110 (SR 110) is a primary state highway in the U.S. state of Virginia. Known as the Jefferson Davis Highway, the state highway runs from U.S. Route 1 (US 1) and Interstate 395 (I-395) in Crystal City north to I-66 in Rosslyn within Arlington County. SR 110 is a four- to six-lane freeway that parallels the Potomac River, providing a connection between several of Arlington's urban villages. The state highway also provides access to the Pentagon, which is the headquarters of the United States Department of Defense, the grounds of Arlington National Cemetery, and SR 27, an east–west freeway between the Pentagon and the cemetery. SR 110 is a part of the National Highway System for its entire length.〔
SR 110 is a part of the Pentagon road network, a network of freeways and surface roads built concurrent with the construction of the Pentagon in the early 1940s. The state highway received its numerical designation in 1964 when maintenance responsibility was transferred to the Virginia Department of Transportation. SR 110's most significant changes in routing were relocation of the highway in Rosslyn to tie into I-66 in the 1980s and relocation of the freeway at the Pentagon to provide a larger security buffer for the building after the September 11 attacks. The highway is sometimes closed for large events held at or around the Pentagon, including the Marine Corps Marathon.〔
==Route description==
SR 110 begins at a partial interchange with US 1 (the southern continuation of the Jefferson Davis Highway) in Crystal City where US 1 joins I-395 to cross the 14th Street Bridge into Washington; the interchange allows access to and from US 1 in the direction of Alexandria. Immediately to the north, the state highway has a partial interchange with I-395 (Henry G. Shirley Memorial Highway) that allows access from southbound SR 110 to northbound I-395 and US 1 and from southbound I-395 to northbound SR 110. The southbound exit ramp also includes a ramp for Army–Navy Drive, one of the main streets of Pentagon City. North of I-395, SR 110 heads north with six lanes immediately to the east of the Pentagon reservation. The southbound freeway has ramps to and from the Pentagon South Parking area, which serves as the main and visitor entrance to the Department of Defense headquarters. SR 110 passes under a pair of pedestrian bridges from Pentagon parking areas on between Boundary Channel Drive, which parallels the freeway, and the Boundary Channel's Pentagon Lagoon. SR 110 has a southbound exit to and entrance from the Pentagon Mall Terrace and River Terrace areas before the highway leaves the vicinity of the Pentagon by passing under SR 27 (Washington Boulevard). The partial interchange between the highways allows access from eastbound SR 27 to northbound SR 110 and from southbound SR 110 to westbound SR 27, which leads to southbound I-395 and SR 244 (Columbia Pike).〔〔
North of SR 27, the freeway passes between the Washington Metro's Blue Line on the east and the grounds of Arlington National Cemetery to the west. SR 110 has a northbound exit to and southbound entrance from Memorial Drive, which is the main entrance to the national cemetery and also leads to the Arlington Memorial Bridge to Washington and the George Washington Memorial Parkway. SR 110 continues north with four lanes and has its sole at-grade intersection at Marshall Drive, which leads to the Marine Corps War Memorial, also known as the Iwo Jima Memorial, and the Netherlands Carillon. The highway leaves the cemetery for the urban village of Rosslyn, where the highway reaches its northern terminus. SR 110 passes under US 50 with no access then has a northbound exit and southbound entrance for Wilson Boulevard, one of the main streets of Rosslyn. Immediately to the north, the highway ends at a partial interchange with I-66 allowing access to and from the direction of Falls Church. Westbound I-66 leads to Dulles International Airport and Front Royal.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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