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Maryland Route 337
Maryland Route 337 (MD 337) is a state highway in the U.S. state of Maryland. Known for most of its length as Allentown Road, the highway runs from MD 5 in Camp Springs east to MD 4 near Forestville. MD 337 runs along the southern end of Morningside and the northern edge of Andrews Air Force Base and provides access to several entrances to the military base. The state highway runs concurrently with the easternmost portion of Suitland Parkway. The parkway stretch of MD 337 is maintained by the National Park Service (NPS) instead of the Maryland State Highway Administration (MDSHA). MD 337 was constructed in the mid- to late 1910s along a course further south than the modern highway. The highway was moved to its present alignment to make way for the construction of Andrews Air Force Base during World War II. The easternmost part of the highway was constructed as Suitland Parkway. The Allentown Road portion of MD 337 was expanded to a multi-lane divided highway in the late 1970s and early 1980s. The Suitland Parkway segment was expanded to a divided highway in the mid-1990s. MDSHA plans to build an interchange at MD 337's eastern terminus with MD 4.
==Route description==
MD 337 begins at a single-point urban interchange with MD 5 (Branch Avenue). Allentown Road continues as a county highway west through Camp Springs and the highway intersects Old Branch Avenue just west of the interchange. MD 337 heads northeast as a four-lane divided highway but becomes a four-lane road with a center turn lane as the highway begins to follow the northern edge of the Andrews Air Force Base military reservation. At Auth Road, the highway becomes divided again and begins to follow the town limit of Morningside. The highway passes an entrance to the military base, intersects an exit ramp from northbound Interstate 95 and I-495 (Capital Beltway), and meets the eastern end of Suitland Road, opposite of which is another entrance to the installation. Suitland Road provides access to the center of Morningside and the southbound direction of the Beltway, which parallels MD 337 along the southern edge of Morningside.〔〔
MD 337 meets the southern end of Forestville Road at an intersection that includes a ramp to northbound I-95 and I-495. Access from the southbound Beltway and full access to Suitland Parkway is provided via county-maintained Forestville Road. MD 337 becomes an undivided highway, leaves Morningside, and gradually curves to the east away from the Beltway. The highway reduces to two lanes and then becomes one-way eastbound shortly before it merges with the federally maintained Suitland Parkway. Westbound MD 337 traffic follows Suitland Road west to Forestville Road, then heads south on the county highway to connect with Allentown Road. MD 337 becomes state-maintained again at its trumpet interchange with the access road to the north gate of Andrews Air Force Base. The ramp from the base to westbound Suitland Parkway includes a right-in/right-out interchange with Old Marlboro Pike. MD 337 and Suitland Parkway reach their eastern terminus just east of the interchange at MD 4 (Pennsylvania Avenue) southeast of Forestville. The roadway continues east as Presidential Parkway.〔〔
MD 337 is part of the main National Highway System from Suitland Road to the ramp to northbound I-95 and I-495 and from the north entrance to Andrews Air Force Base to MD 4; the adjacent portion of Suitland Parkway is also part of the main National Highway System.〔〔
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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