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Maryland Route 212
Maryland Route 212 (MD 212) is a state highway in the U.S. state of Maryland. The highway runs from the District of Columbia boundary in Chillum north and east to U.S. Route 1 (US 1) near Beltsville. MD 212 connects the northern Prince George's County communities of Chillum, Langley Park, Adelphi, Hillandale, Calverton, and Beltsville. The highway was constructed from Washington to Adelphi in the early 1910s and extended north through Adelphi to Hillandale in the early 1930s. A separate portion of MD 212 was built from west of US 1 through Beltsville to what is now MD 201 in the early 1930s; the two sections were unified in the early 1940s. The route was expanded to a divided highway south of Langley Park in the early 1960s and at Interstate 95 (I-95) in the early 1970s. MD 212's eastern terminus was relocated north of Beltsville after a series of county highways were upgraded and brought into the state highway system in the 2000s and early 2010s; the old highway through Beltsville to MD 201 became MD 212A.
==Route description==
MD 212 begins at the District of Columbia boundary at Eastern Avenue in Chillum. Riggs Road continues into Washington as a four-lane undivided highway to its southern end at North Capitol Street and Missouri Avenue. MD 212 heads northeast along Riggs Road, which is a four-lane divided highway with bike and parking lanes. A short distance north of Eastern Avenue, the highway intersects Chillum Road, which heads east as MD 501. MD 212 expands to six lanes at its intersection with Sargent Road, then crosses Sligo Creek and intersects the Sligo Creek Trail shortly before its intersection with MD 410 (East–West Highway). The highway continues north into Langley Park and intersects MD 193 (University Boulevard). North of MD 193, MD 212 veers northeast and drops to two lanes.〔〔
MD 212 crosses the Northwest Branch of the Anacostia River at the site of the historic Adelphi Mill. The highway intersects Metzerott Road and Adelphi Road and follows the edge of George Washington Cemetery as it passes through the community of Adelphi. MD 212 crosses over I-495 (Capital Beltway) with no access and completes its Rigg Road section at Powder Mill Road in Hillandale. This intersection is located just east of the Prince George's–Montgomery county line; Powder Mill Road continues west as a county highway into the latter county. MD 212 continues northeast along Powder Mill Road, which passes the U.S. Army Research Laboratory and crosses Paint Branch.〔〔
MD 212 expands to four lanes south of its intersection with Cherry Hill Road in Calverton. The highway becomes divided at Beltsville Drive just west of its cloverleaf interchange with I-95, within which it crosses Little Paint Branch. MD 212 temporarily expands to six lanes on either side of its intersection with Old Gunpowder Road and county-maintained Powder Mill Road on the western edge of Beltsville. A short distance southeast of the intersection, Powder Mill Road again becomes state maintained as MD 212A, which passes through the center of Beltsville. MD 212 continues east as a four-lane divided highway along Ammendale Road. Just east of Indian Creek, Ammendale Road turns south from the route toward the historic Ammendale Normal Institute; the state route continues along Virginia Manor Road, which expands to six lanes as it enters an office park. When Virginia Manor Road itself splits to the northeast, MD 212 continues southeast along Ritz Way to its eastern terminus at US 1 just west of CSX's Capital Subdivision rail line north of Beltsville.〔〔
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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